Post-fermented tea is finished leaf put through a controlled fermentation — ours in Uji, with the koji mould used for miso and sake. It tastes almost nothing like green tea: strawberry-like and slightly tart, with very little caffeine.
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Post-fermented tea is made by putting finished leaf through a controlled fermentation, a step no other Japanese tea category uses. Ours is fermented in Uji with koji, the same mould used to make soy sauce, sake and miso, and that is what gives it its pink colour and its gentle acidity. The result tastes almost nothing like green tea: strawberry-like and slightly tart, which is why it is known in Japan as the rose of tea. Fermentation leaves very little caffeine behind, so it can be drunk at any hour, hot or chilled over ice. It is the most unusual tea we sell, and the one we would hand to someone who thinks they do not like tea.
How it is grown and made, how it tastes, and how to brew it.
Tea Type
Post-fermented tea
Processing
Finished leaf put through a controlled fermentation with koji, the mould used for miso, soy sauce and sake.
Taste
Fruity, floral, sweet-tart
Caffeine
~22 mg per serving (5 g)
Shading
Unshaded — grown in full sun
Leaf Composition
Young leaves
Water Temperature
60°C (140°F)
Brewing Time
1 minute
Number of Infusions
3
How to Make Fermented Tea Like a Pro
Fermented tea is best at a low temperature and a short steep, which keeps the fruit and the gentle acidity in balance. Brewed too hot or too long it turns either sharp or watery. It is also excellent chilled over ice.
Heat the Water
Heat water to 60°C (140°F).
Add the Leaves
Add 5 g of leaves to a kyusu teapot.
Steep
Pour 150 ml of water and steep for 1 minute.
Pour & Brew Again
Pour out every drop, then brew the same leaves 2 more times (20 seconds each).
Caffeine Level in Fermented Tea
~22 mg per serving (5 g)
How Fermented Tea Is Made
From the field to the finished leaf, the five steps behind every batch.
Grown in Full Sun
Unshaded
Steamed and Dried
Fermented with Koji
The Mould Used for Miso
Dried
Rested and Blended
Why Organic Fermented Tea Fields Make a Difference
Tea plants absorb everything from the soil, making pesticide-free farming especially important. The farmers we work with have found a way to grow delicious tea without harming the natural ecosystem.
ORGANIC
NON-ORGANIC
Why Buy Your Tea from Nio Teas
No middlemen, no pesticides, no risk.
30-Day Satisfaction Guarantee
Try it with confidence. If it isn’t right for you, contact us within 30 days.
Nio teas has been my favourite place to purchase good quality teas for a while now, and still they never disappoint me. Their teas are excellent quality, however, I’d like to give more attention to customer service - Nio team has been very kind and helpful each time I had any sort of problem. Their customer service never disappoints, they are very attentive and quick in responding to any queries, hence why I’ve been a loyal customer for a while now.
Apr 1, 2026
5 out of 5 stars
5/5
Sean
My favorite vendor for Japanese organic loose leaf green teas. They are sourcing some of the best organic teas out of Japan and supporting family farmers and the growing organic tea industry as a whole. I have ordered from every vendor for years and Nio consistently has the best prices and selection overall. They provide top notch customer service and fast shipping as well. Highly recommended 🍃
Shipping is free once your order passes the threshold for your country — USD 54.99 · EUR 54.99 · GBP 44.99 · CHF 49.99 · CAD 74.99 · DKK 399 · SEK 599 · PLN 229 · CZK 1,290. Everywhere else it's the equivalent of USD 54.99, converted automatically. Below the threshold a flat rate applies, always shown at checkout before you pay.
We ship from warehouses in the US, the EU and Japan — whichever is closest to you. US and EU orders arrive in 4–12 business days; the handful of countries served from Japan take around 10. Business days count from dispatch rather than from when you order, and exclude weekends and public holidays. You'll get a tracking number by email the moment your parcel leaves the warehouse.
We only buy from fields grown without pesticides or chemicals. We ask each farmer directly how they manage their land, visit the plantation and processing facility ourselves, taste every harvest before committing, and check that the biodiversity around the fields is alive. Small family farms don't always carry paperwork — so we verify it in person instead.
Japanese green tea covers an enormous range, and choosing online isn't easy. If you've tried yours and it isn't for you, email info@nioteas.com within 30 days with your order number and a line on what you didn't enjoy. We'll send a different tea of equal or lower value, free. Nothing to post back — keep it, share it, or try brewing it cooler. Once per order.
Email info@nioteas.com within 30 days with your order number and a photo. We'll approve it, cover the return postage with a prepaid label or a reimbursement, and refund you — no restocking fee. Refunds go to your original payment method within 2 business days of the return reaching us; your bank may take another 5–20 to show it.
Unopened items in their original packaging can be returned within 30 days. Tea is sealed for hygiene, so opened packs can't come back — but the swap above covers exactly that situation. Return postage is yours unless the item arrived damaged, defective or incorrect.
Orders to the US and EU ship domestically from our local warehouse, so there's no customs charge and no duty. A small number of destinations are served from our Japan warehouse, where your own customs authority may apply import duty, VAT or a carrier handling fee on delivery. Those are set by your country, not by us. Ask before you order and we'll help you check.
