Most people who drink matcha have only ever encountered usucha — thin tea — the everyday frothy bowl that fills cafés worldwide. But there is another form, older and more revered: koicha (濃茶, "thick tea"). Richer, denser, and far more intense than anything you've likely tasted, koicha is the beating heart of Japanese tea ceremony, and it is achievable at home with the right approach.
Koicha vs usucha: the fundamental difference
The distinction between Japan's two forms of prepared matcha goes deeper than just the ratio of powder to water:
| Factor | Koicha (thick tea) | Usucha (thin tea) |
|---|---|---|
| Powder per serving | 3–4g | 1–2g |
| Water volume | 30–40ml | 60–80ml |
| Consistency | Thick, paste-like syrup | Thin, frothy liquid |
| Technique | Slow kneading — no foam | Rapid whisking — maximum foam |
| Chasen type | 48–60 prong (thick tines) | 80–100 prong (fine tines) |
| Matcha grade required | Highest ceremonial only | Ceremonial to culinary |
| Flavour intensity | Extremely concentrated, sweet, dense umami | Moderate, grassy, light umami |
| Ceremony role | Centrepiece — shared among guests | Lighter course, individual |
| Served with | Substantial wagashi (sweet confection) | Lighter confection or alone |
| Caffeine | ~100–140mg per serving | 35–70mg per serving |
The taste of koicha
Koicha is unlike any other drink. The closest analogy might be a very concentrated espresso — but the flavour world is entirely different. A well-made koicha is intensely sweet (not bitter), deeply oceanic and umami-rich, with a thick, almost silky mouthfeel that coats the palate. The flavour evolves as you hold it in your mouth: initial sweetness, then a profound depth of vegetal complexity, then a lingering warmth in the throat.
Bad koicha — made with low-grade matcha — is aggressively bitter, astringent, and unpleasant. This is why quality is non-negotiable: with koicha, there is nowhere to hide.
The wagashi connection: In tea ceremony, koicha is always preceded by a wagashi — a Japanese sweet confection, typically made from sweet red bean paste and mochi. The wagashi is eaten first, not during, so that the sweetness of the confection harmonises with and amplifies the natural sweetness of the koicha. This sequencing is deliberately considered.
What matcha grade do you need for koicha?
This cannot be overstated: koicha demands the highest quality ceremonial-grade matcha you can access. For usucha, mid-range ceremonial grades are perfectly acceptable. For koicha, you need premium, first-harvest matcha from a reputable Uji producer.
The reasons are purely practical:
- At 3–4g per serving, any bitterness or astringency in lower-grade matcha is amplified by a factor of two to three.
- Koicha's paste-like consistency means every flavour characteristic — good and bad — is concentrated rather than diluted.
- The natural sweetness that makes koicha revelatory is present only in high-grade, high-L-theanine tencha. Budget matcha lacks this profile entirely.
Recommended koicha-grade matcha: Marukyu Koyamaen Wako, Ippodo Ummon, or similar first-class ceremonial grades from established Uji producers. Expect to spend £40–£80+ for 30g used exclusively for koicha.
Equipment needed for koicha
- Chawan (tea bowl): A wider, deeper bowl than used for usucha — you need space to work the paste without spilling. Traditional koicha bowls are thick-walled to retain heat and wider at the base.
- Chasen: A 48–60 prong chasen with thicker, more rigid tines. Fine 100-prong whisks designed for usucha can break under the resistance of thick koicha paste.
- Chashaku (bamboo tea scoop): For measuring precise amounts of matcha — each scoop is approximately 0.3–0.5g. You'll need 8–10 scoops for koicha.
- Fine-mesh sieve: Sifting koicha matcha is even more critical than for usucha, as any lumps are nearly impossible to work out in thick paste.
- Thermometer or cooling vessel: Water at 80°C — slightly higher than for usucha, but still not boiling.
How to prepare koicha at home
- Hydrate your chasen: Place in warm water for 2 minutes. Koicha puts significant stress on the prongs — a dry chasen will break.
- Warm the chawan: Pour hot water into the bowl, swirl, discard. Warming the bowl prevents the paste from cooling too quickly on contact with cold ceramic.
- Sift 3.5–4g of matcha through a fine-mesh sieve directly into the warm, dry chawan. Sifting is not optional for koicha.
- Add water in small increments: Begin with just 10–15ml of water at 80°C. This creates a paste. Do not add all the water at once.
- Knead the paste: Using the chasen, press and work the matcha paste with slow, deliberate strokes — not whisking. The goal is to create a completely homogeneous paste with no dry powder remaining.
- Add remaining water: Pour the remaining 20–25ml of water (to reach ~35–40ml total) and continue working slowly with the chasen. The consistency should resemble a thick, glossy sauce — not liquid, not powder.
- No foam: Finish by pressing out any trapped air bubbles. Koicha should have a smooth, matte surface — the opposite of usucha's frothy top.
- Drink within 30 seconds. Koicha settles quickly.
The paste test: Lift your chasen and watch how the koicha drips from it. Correct koicha should fall in a slow, thick stream — similar to warm honey or thick syrup. If it pours freely like liquid, you've added too much water. If it doesn't drip at all, add a small amount more.
Koicha in traditional tea ceremony (chadō)
In formal Japanese tea ceremony, koicha occupies a position of far greater ceremonial weight than usucha. A full-length ceremony (chaji) typically includes a meal, a break, koicha — as the central, most solemn preparation — followed by usucha as a lighter closing.
The etiquette around koicha is specific and elaborate. A single bowl is typically shared among several guests, who each rotate the bowl before drinking to avoid touching the "front" face of the chawan. Each guest holds the bowl in both palms and bows before drinking. The bowl is wiped clean after each guest drinks, then passed. This sharing practice — mawashi nomi — is intentional: koicha represents deep mutual trust and intimacy between the host and guests.
In the context of the tea ceremony, koicha is understood as a metaphor for the depth of relationship being shared — which is why only the finest, most carefully prepared matcha is used for it.
Find a tea room that serves koicha near you
Some specialty matcha cafés and Japanese tea rooms offer koicha service — discover them in your city.
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