Kosyuen, part of the Brook's group, was founded in 1968 as a small Japanese tea shop rooted in a deep respect for quality, tradition, and heartfelt hospitality.
Kosyuen is a Japanese tea brand committed to delivering exceptional flavor through carefully selected tea leaves and traditional, refined production methods. We continue to uphold our founding belief in quality and artisan spirit.
With every cup, we bring you the same uncompromising quality and taste — to support your wellness, every single day.
Kosyuen, part of the Brook's group, was founded in 1968 as a small Japanese tea shop rooted in a deep respect for quality, tradition, and heartfelt hospitality.
Kosyuen is a Japanese tea brand committed to delivering exceptional flavor through carefully selected tea leaves and traditional, refined production methods. We continue to uphold our founding belief in quality and artisan spirit.
With every cup, we bring you the same uncompromising quality and taste — to support your wellness, every single day.
Tea leaf selection
Kosyuen carefully selects tea leaves from most renowned tea-growing regions in Japan— including Shizuoka, Kagoshima, and Kyoto — each offering its own distinctive flavor and character.
Artisan production
Artisan production
By precisely adjusting the roasting temperature, time, and number of cycles, we enhance not just the bitterness but the authentic umami and fragrance unique to the tea leaves. Kosyuen’s unique “deep-steaming” method involves steaming the tea leaves longer than ordinary sencha, followed by a careful roasting process to bring out a richer flavor.
By precisely adjusting the roasting temperature, time, and number of cycles, we enhance not just the bitterness but the authentic umami and fragrance unique to the tea leaves. Kosyuen’s unique “deep-steaming” method involves steaming the tea leaves longer than ordinary sencha, followed by a careful roasting process to bring out a richer flavor.
Taylored taste
To create a rich and full-bodied flavor where depth, umami, and sweetness come together, we blend tea leaves from different regions, along with powdered tea and matcha, carefully selecting each variety.
We take pride in the clarity and color of our tea, offering a visually delightful experience alongside its refined taste.
Kosyuen delivers Japanese tea with heartfelt sincerity, ensuring every cup reflects our dedication and care.
At Kosyuen, we offer a diverse lineup of products featuring a variety of flavors and formats to suit every preference.
Perfect for everyday enjoyment or as a thoughtful gift for any occasion.
Organic Matcha
Made with 100% locally grown, JAS-certified organic matcha. Also available internationally.
Loose Leaf Tea
We offer a variety of options including sencha, genmaicha, hojicha, and more.
Tōbicha (Functional Food)
A delicious powdered tea that supports healthy blood sugar and triglyceride levels, while delivering the rich flavor and aroma of green tea.
Individually Wrapped Tea Bags
Convenient single-serve packaging perfect for on-the-go. Beautifully designed packaging makes them ideal for entertaining guests as well.
Large Pack Tea Bags
An eco-friendly and cost-effective option, offering authentic Japanese tea that stays delicious through a second brew.
Cold Brew Tea
Simply steep the tea bag in cold water for an authentic, refreshing flavor at home with ease.
Preparing sencha
Preparing sencha
(for Loose Leaf Tea)
Boil and cool hot water
Pour boiling water into tea cup and allow to cool. The ideal temperature is 70–80°C (158–176°F). Higher-quality teas are brewed at lower temperatures.
Place the tea leaves into the teapot.
Place the tea leaves in the warmed teapot. Use 3/4 of a teaspoon (approx. 3g) per person.
Pour hot water into the teapot.
Pour the cooled water into the teapot and steep. For high quality sencha, steep for 2 minutes; for deep-steamed tea, steep for 60 to 90 seconds.
Pour the tea evenly for consistent taste.
Pour the tea gradually and evenly into the warmed teacups so that taste and color of the tea is evenly distributed, making sure you pour every last drop.
Enjoy your tea.
For the second brew, use hotter water (80–90°C / 176–194°F) and shorten the steeping time to approx. 10 seconds.
Preparing tea bags
Place the tea bag into the cup.
Place one tea bag into a cup or teapot (about 140–180 ml).
Pour boiling water.
Hook the tea bag tag onto the rim of the cup to secure it before pouring hot water.
*Please use water that has been brought to a full boil.
Enjoy your tea.
After about 1 minute, remove the tea bag and enjoy your tea.
*Adjust the water amount and steeping time according to your preference.
