Sip, Savor, and Soar: Dive into Korea’s Rich Tea Culture with OSULLOC

OSULLOC is the tea brand AMOREPACIFIC built on a single island. Since 1979, it has farmed Camellia sinensis on Jeju — Korea's volcanic island off the southern coast — and turned that raw material into one of the most recognisable tea ranges in the country. Every box in the OSULLOC range traces its green tea character back to those same fields, and that is not a marketing claim: it is a supply chain that has been in place for over four decades.

This article covers the full picture: the story behind OSULLOC and its Jeju roots, the structure of the range from pure green teas to blended infusions and tea-flavoured snacks, the specific products worth knowing by name, and who this brand suits best. Everything referenced below is in stock at Kool Seoul, sourced directly from Seoul and shipped worldwide via DHL Express — free on orders over $150.

OSULLOC and Jeju — where the brand begins

Osulloc Jeju Pure Green Tea 20 Pthe entry-level Jeju green tea — clean, grassy, no additions$12Shop now →

Jeju is not an obvious place to grow tea. The island sits at the southern edge of Korea in the Korea Strait, exposed to Pacific weather, built from basalt from repeated volcanic eruptions, and subject to extremes — typhoon-season rain in summer, cold dry winds off China in winter. None of that sounds like ideal tea terroir. And yet the combination of mineral-rich volcanic soil, high rainfall, and a climate warm enough for Camellia sinensis to grow outdoors year-round turns out to produce green tea with a distinct character: faintly mineral, slightly sweet on the finish, with the grassy brightness that defines good Korean green tea but without the astringency that poor-quality or over-steeped leaf can introduce.

AMOREPACIFIC, the Korean beauty and wellness conglomerate, recognised that potential early. The first OSULLOC tea gardens were established on Jeju in 1979, at a time when Korean tea culture was still recovering from decades of disruption — Japanese colonial-era suppression of traditional Korean tea ceremony, followed by the Korean War and a post-war economy focused on staples rather than luxury beverage culture. AMOREPACIFIC's founder, Suh Sung-hwan, had a personal conviction that Korean tea deserved the same institutional investment that Japan had poured into its green tea industry. OSULLOC was the result: a vertically integrated tea operation that controls growing, picking, processing and blending under one roof.

That integration matters for quality. OSULLOC picks its own leaf, so it controls harvest timing — the grade difference between Sejak (a second-flush, early-spring pick) and a later flush is meaningful, and OSULLOC can guarantee which grade goes into which product. It processes its own leaf, so it controls roasting, steaming and rolling profiles. And it blends its own infusions, which means the flavoured teas in the range are matched to a specific green, black or oolong base that OSULLOC actually grew, not commodity leaf purchased on the open market.

Pure green teas — the Jeju range

Osulloc Sejack Green Tea 20 Psecond-flush Jeju green tea — the grade serious tea drinkers reach for$33Shop now →

Korean green tea has its own grading language, distinct from the Japanese matcha-and-sencha vocabulary most western tea drinkers know. The most coveted grade is ujeon, plucked before the first grain rain in late April — rare, expensive, and available in small volumes. Below it sits sejak, the second flush from early May, which delivers more body than ujeon while retaining the delicate, slightly vegetal top note that characterises Korean green tea at its best. A third pick, jungjak, gives a fuller, grassier cup used in everyday drinking.

The Sejack Green Tea 20 P is the OSULLOC reference most worth knowing by name if you already drink Japanese green tea and want to understand how the Korean style differs. It brews pale yellow-green, with a clean mineral finish and that characteristic lightness that comes from steaming rather than pan-firing the leaf. The recommended brewing temperature is 70–75°C — not boiling, which would turn the tannins bitter — and two minutes is enough for the first steep. These are teabag-format, which makes the grade accessible without requiring a gaiwan setup.

The Jeju Pure Green Tea 20 P at $12 is the everyday version — a clean, unfussy green tea without any additions, designed for people who drink several cups a day and want something uncomplicated. Both products illustrate OSULLOC's core promise: Jeju leaf, honestly labelled, prepared to drink without fuss.

For the traditional format, the Sejac Tea 10p is the ten-bag version of the sejak grade, with packaging that makes it a natural gift for anyone curious about Korean tea ceremony. And the Green Oolong Tea 10p bridges the gap between green and oolong styles — a partially oxidised leaf that sits closer to the green end of the spectrum, with more complexity and a longer finish than the pure green teas.

The matcha and powder range

Osulloc Jeju Matcha Milk Tea 10pa creamy, ready-to-whisk Jeju matcha latte blend$21Shop now →

Matcha in the Korean context is stone-ground Jeju green tea, identical in principle to Japanese matcha but with a slightly different flavour profile — less umami-forward, slightly more grassy — because the leaf is shade-grown for shorter periods and the cultivars differ. OSULLOC makes its matcha from Jeju leaf ground to order, and the range it builds around that base is worth knowing.

The Green Tea Powder 40g is the ingredient-grade powder — 100% stone-ground Jeju green tea with no additions, intended for whisking into hot water for a traditional bowl or for baking. At $11, it is the most accessible entry to Korean matcha, and it works well in smoothies, lattes and any recipe where you want a real green tea flavour without the hassle of brewing loose leaf.

The Premium Matcha 40g at $26 is a step up in grade — a finer grind with a more vivid green colour and a smoother, less astringent taste that rewards drinking straight rather than cooking with. And the Jeju Matcha Milk Tea 10p is OSULLOC's interpretation of the matcha latte trend: individual-serve sachets that blend matcha with milk solids for a creamy cup that does not require a whisk, a bamboo chasen or any ceremony at all. It is the product we recommend for first-time buyers who are curious about matcha but not ready to invest in equipment.

The matcha range extends into the snack line. The Green Tea Milk Spread 200g is a matcha spread for toast or pastry — sweet, slightly grassy, and richer than most western matcha spreads because it uses a higher leaf-to-sugar ratio. The Matcha Pretzel 70g and Green Tea Wafers 100g are both well-made snack formats that taste like OSULLOC tea rather than artificial green-tea flavouring — the difference between using real stone-ground leaf versus an extract shows up clearly in both.

Blended teas — the flavoured and herbal range

Osulloc Tangerine Flower Tea 10pJeju mandarin blended with camellia — a Korea-only classic$29Shop now →

The blended range is where OSULLOC's Jeju identity becomes most legible to an international audience. Jeju produces two things the rest of Korea does not: tea and tangerines. The island's hallabong and gamgyul tangerine varieties are as emblematic of Jeju as the tea gardens, and OSULLOC has built several products that combine the two. The Tangerine Flower Tea 10p is the clearest expression: dried Jeju tangerine peel blended with camellia flower and green tea base, producing a citrus-floral cup that is distinctly Korean and difficult to reproduce outside the island's terroir. At $29 for ten bags, it sits higher than the everyday teas, but it is a genuine regional product rather than an artificial flavouring exercise.

The black tea blends cover more familiar ground for western palates. The Fig Apple Black Tea 10 P combines fig and apple with a full-bodied black base — autumnal, round, naturally sweet without added sugar. The Marron Cream Black Tea 10 P is a chestnut-cream blend that reads like a very well-made flavoured British black tea, and the Earl Grey Milk Tea 10 P is an Earl Grey with added milk solids, close in concept to the Hong Kong milk tea style. All three are high-quality blends built on real tea leaf rather than flavoured paper bags — the bergamot in the Earl Grey, for example, comes from natural orange oil and is present at a level you can actually smell when you open the sachet.

The cold brew line gives the blended range a summer format. The Sunset Peach Cold Brew Tea 20 P and Moonlight Honey Pear Cold Brew Tea 20 P are cold-steep teabags — drop one into a 500ml bottle of cold water, leave in the refrigerator for four to eight hours, and the result is a clear, lightly sweet cold tea that needs no straining and no sugar. These are among the better-executed cold brew formats we have come across in the Korean market: the extraction is controlled so the tea does not turn bitter overnight, and the fruit notes stay bright rather than synthetic.

Oolong, rooibos and herbal infusions

The OSULLOC oolong range covers two distinct styles. The Jeju Volcanic Oolong Tea 20 P is a lightly oxidised oolong with a soft, creamy body and a mineral quality that comes from the volcanic soil. It is the oolong to reach for if you drink Taiwanese high-mountain oolongs and want a Korean comparison point. The Milky Oolong Tea 10 P is a roasted, milk-oolong style — more oxidised, with a warm, slightly caramelised character that suits afternoon drinking.

The rooibos line reflects OSULLOC's understanding that not every customer wants caffeine. The Rooibos Moonlight 10p is a classic caffeine-free rooibos blend built for evening use. The Rooibos Caramel Berry Tea 10p is a warmer, dessert-adjacent blend — caramel and mixed berry on a full rooibos base — that works as a caffeine-free alternative to a flavoured black tea. The herbal line includes the Chamomile Blend 10 P, which pairs chamomile with a light green tea base for a gentler, less medicinal cup than pure chamomile.

Tea sets and gift formats

Osulloc Tea Garden Set 2025a curated garden-to-cup gift set across OSULLOC's full range$79Shop now →

OSULLOC packages well. The gift range is a meaningful part of the brand's business in Korea — tea is a traditional Korean gift for important occasions, and OSULLOC's packaging has been designed with that in mind. Products arrive in minimalist boxes with Jeju-inspired photography and typography that reads more refined than most food packaging in the Korean market.

The Tea Garden Set 2025 at $79 is the most complete gift format in the range — a curated selection across OSULLOC's categories presented in a single box. It covers green, black and oolong, which makes it the right gift for someone who wants to explore Korean tea culture across multiple styles rather than receiving a large quantity of one thing. The Tea Variation 30p Set at $29 is a more affordable sampler — thirty bags across several flavours — and it is the set we recommend for new buyers who want to try before committing to a single variety. The Premium Tea Collection 90 Set at $79 is a ninety-bag format for regular tea drinkers who want a large supply across multiple styles.

For a single-variety gift format, the Lovely Tea Box Set at $27 presents OSULLOC's signature teas in a gift-ready format that works for birthdays, corporate gifts or any occasion where you want to send something from Korea that isn't skincare. The Master Blend Set at $83 is OSULLOC's premium gift offering — the highest-grade teas in the range, presented in packaging that reflects their price point.

The snack range — when tea becomes food

OSULLOC's snack range sits alongside the tea range in a coherent way that most food brands struggle to achieve. The principle is simple: the same Jeju green tea and matcha that goes into the teabags also goes into the food products, so the flavour reads as genuinely tea-based rather than artificially green.

The Green Tea Langue De Chat 10 P is a French-style biscuit format with a thin, crisp shell and a matcha filling — the contrast of buttery pastry and clean green tea is well-calibrated and not too sweet. The Signature Biscuits 10 P are OSULLOC's everyday biscuit range, designed to accompany a cup of green tea. The Matcha Biscotti Chips 100g are a baked biscotti format — dryer and crunchier than the langues de chat, closer to what an Italian biscotti shop would make if they had access to Jeju matcha. And the Jeju Green Tea Almond Ball 80g is a confection format — green-tea-dusted almonds that sit somewhere between a snack and a dessert. All four make natural additions to an OSULLOC order if you want to give a tea-and-snack pairing as a gift.

Who OSULLOC is really for — and who it isn't

OSULLOC is the right brand if you want to understand Korean tea culture through a single, reliable source; if you already drink Japanese green tea and want to explore the Korean equivalent; if you are looking for a premium Korean food gift that is not skincare or cosmetics; or if you drink tea regularly and want a range wide enough to cover morning green tea, afternoon oolong, post-dinner herbal infusions and cold brew for summer, all from one brand.

OSULLOC is less suited to buyers who want ultra-premium loose-leaf tea in the style of specialist Japanese or Taiwanese tea houses — the OSULLOC range is teabag-first, designed for everyday convenience rather than ceremonial brewing. The pure green teas are excellent by teabag standards, but if your baseline is ujeon loose leaf brewed gongfu-style, these products serve a different purpose. Similarly, if your primary interest is very strong, malty black teas in the Assam style, OSULLOC's black tea blends are all lighter and more delicate than that profile. The brand sits in a sweet spot between daily drinker and quality gift, which is where most of its Korean customers use it.

How to brew OSULLOC teas well

Korean green tea is more heat-sensitive than black tea. The consistent OSULLOC recommendation is 70–80°C water for all green tea products, including matcha. Boiling water (100°C) will extract bitter tannins and flatten the mineral quality of the Jeju leaf. The simplest method: boil a kettle, pour into a cup, wait ninety seconds, then pour onto the teabag. Two minutes brewing time is enough for the first steep; if you want a second steep from the same bag, add thirty seconds. For the cold brew bags, cold tap water in a sealed bottle, eight hours in the refrigerator, no stirring required.

For the matcha powder products, 70–80°C water and a bamboo whisk (chasen) gives the best result — about 70ml of water for a traditional thick bowl, 150ml for a thinner drinking-style cup. The milk tea sachets can be dissolved in hot water (150ml) or cold milk directly from the refrigerator, which gives a more creamy, latte-style result.

OSULLOC — frequently asked questions

What is OSULLOC and who makes it?

OSULLOC is a Korean tea brand owned by AMOREPACIFIC, the South Korean beauty and wellness conglomerate. AMOREPACIFIC established OSULLOC's first tea gardens on Jeju Island in 1979, making it one of the longest-running commercial tea operations in Korea. OSULLOC grows, harvests, processes and blends its own teas on Jeju, and distributes them through AMOREPACIFIC's retail and e-commerce networks. Every OSULLOC product sold at Kool Seoul is sourced from the Korean market through the same distribution channels used by AMOREPACIFIC's own retail stores.

Why does OSULLOC grow its tea on Jeju specifically?

Jeju Island's volcanic basalt soil, high rainfall and relatively warm temperatures year-round create conditions well-suited to Camellia sinensis. The volcanic mineral content influences the flavour of the leaf — producing a slightly mineral, clean-finishing green tea character that is different from mainland Korean or Japanese equivalents. AMOREPACIFIC chose Jeju over mainland Korean growing regions because the climate allows year-round field management and because the island's relative isolation reduces pest pressure, supporting organic-adjacent farming practices.

What is the difference between OSULLOC green tea grades?

OSULLOC uses the traditional Korean tea-grading terminology: ujeon (before the grain rain, late April, the rarest and most delicate), sejak (second flush, early May, the grade most people refer to when they describe Korean green tea at its best), and jungjak (third flush, fuller and more grassy). The Sejack Green Tea 20 P at Kool Seoul is a sejak-grade product; the Jeju Pure Green Tea 20 P is a jungjak-grade everyday tea. The difference in flavour is real: sejak is lighter, more complex and more forgiving to brew; jungjak is fuller, more robust and more tolerant of higher temperatures.

Is OSULLOC matcha the same as Japanese matcha?

OSULLOC matcha is stone-ground Jeju green tea, produced by the same method as Japanese matcha but from Korean cultivars grown in Jeju's specific terroir. The flavour profile differs: OSULLOC matcha tends to be less umami-forward than high-grade Japanese ceremonial matcha, with a slightly brighter, more citrus-adjacent green note and lower intensity of the "seaweed" character that dominates premium Japanese grades. For everyday drinking and baking, OSULLOC matcha performs comparably to Japanese culinary matcha; for ceremonial use in a traditional Japanese tea context, the two are not interchangeable.

Can I order OSULLOC outside Korea?

Yes. Kool Seoul ships the full OSULLOC range from Seoul via DHL Express with end-to-end tracking. Transit time to the US, Europe and Australia is typically three to six business days once the parcel is scanned. Shipping is free on orders over $150. Customs and import duties vary by destination — we recommend checking your country's import rules for food products before ordering. We ship Korean-market OSULLOC packaging with Korean production codes, not grey-market or airport-duty-free stock.

Are OSULLOC teas caffeinated?

All products based on Camellia sinensis — green tea, oolong, black tea and matcha — contain caffeine at levels typical for their category (green tea approximately 20–40mg per cup, matcha approximately 40–70mg per serving depending on quantity used, black tea approximately 40–70mg per cup). OSULLOC's rooibos and herbal infusions are caffeine-free. The Chamomile Blend, Rooibos Moonlight, Rooibos Caramel Berry and cold brew herbal teas are all suitable for caffeine-sensitive drinkers. OSULLOC clearly labels caffeine content on Korean-market packaging.

What is the shelf life of OSULLOC products?

Teabag products typically carry a shelf life of eighteen to twenty-four months from production date. Matcha and green tea powder products have a shorter shelf life once opened — typically three to six months if stored in a sealed container away from light, air and moisture. Snack products (biscuits, pretzels, wafers) carry standard food shelf lives of six to twelve months. All OSULLOC products we ship from Kool Seoul are within their Korean-market best-before dates, and we check production dates before dispatch.

What makes OSULLOC a good gift from Korea?

Korean tea is one of the traditional Korean gift categories — offering tea to someone signals respect and thoughtfulness in Korean gift culture, particularly for Chuseok (autumn harvest) and Seollal (Lunar New Year) occasions. OSULLOC's packaging reflects that gifting culture: the boxes are clean, elegant and clearly premium without being ostentatious. The range is also safe for most dietary requirements (naturally gluten-free teabags, vegan, no artificial colours in the pure tea range), which reduces the risk of sending a gift someone cannot use. Internationally, OSULLOC works as a gift because the Jeju-grown provenance story is legible to anyone who has a passing familiarity with Korean culture, and because high-quality tea is a universal pleasure that does not require the recipient to be a K-beauty fan.

Our OSULLOC selection at Kool Seoul

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Why shop OSULLOC at Kool Seoul

— Seo-yeon, team Kool Seoul · sourced from Seoul, shipped worldwide