Koicha: the art of thick tea in the Japanese tea ceremony

When you enjoy your daily matcha, you're likely consuming Usucha (thin, frothy tea) without even realizing it. Yet, at the heart of traditional Japanese tea ceremonies lies a far more intimate and refined experience: Koicha , literally "thick tea." This ancient preparation represents the epitome of tea artistry, reserved for the most precious moments and the most honored guests.

If the matcha you know is like a delicate cappuccino, Koicha is the equivalent of a smooth espresso: concentrated, deep, revealing every nuance of its terroir. But be warned: this intensity leaves no room for error. With Koicha, only excellence is revealed... or bitterness is exposed.

What is Koicha?

Koicha (濃茶) literally means "thick tea" in Japanese . In the Cha-no-yu tradition, it represents the most refined and spiritual way to prepare matcha. Unlike Usucha, which can be served individually, Koicha is traditionally shared in a single bowl among guests, symbolizing unity and mutual respect.

This practice dates back centuries, to when Japanese tea masters sought to create a profound meditative experience. Koicha is not simply a beverage; it is a sacred ritual that demands presence, patience, and humility. In the Urasenke and Omotesenke schools, its preparation is taught only to advanced practitioners, as the technique requires great finesse.

The texture of Koicha is reminiscent of warm honey or delicately spread oil paint. Its intense jade-green color and glossy, foam-free surface attest to expert preparation. It's a sensory journey that engages all the senses: first sight, then touch through the warmth of the bowl, and finally the explosion of umami in the mouth that lingers for several minutes after the last sip.

Koicha vs Usucha: what are the differences?

To truly appreciate Koicha, one must understand what distinguishes it from its lighter cousin, Usucha. Both preparations use the same matcha, but offer radically different experiences.

Usucha is best enjoyed as a refreshing break in your day. Koicha, on the other hand, demands that you stop completely, sit in silence, and surrender to the present moment. Its dense texture envelops the palate in a creamy sweetness, revealing deep, sometimes buttery, vegetal notes, with a naturally sweet finish that defies logic: how can such a concentrated tea be so sweet?

The answer lies entirely in the quality of the matcha used.

How to prepare Koicha? (step-by-step guide)

Preparing Koicha is an art that differs fundamentally from preparing Usucha. Forget the rapid whisking movements that create the airy foam. Here, slowness reigns supreme.

The essential ingredients

• 4 grams of superior ceremonial grade matcha
• 40 ml of water at exactly 80°C (no more, no less)
• A preheated matcha bowl (chawan)
• A bamboo whip (chasen), preferably with 80 strands or more

Step 1: Sift your matcha

This step is absolutely crucial for Koicha . With such a high concentration, even the slightest lump will create an unpleasant, almost grainy texture. Use a fine sieve and gently press the powder through it with a bamboo spoon. You should obtain an airy, almost ethereal powder.

Step 2: Water at the exact temperature

Heat your water to 80°C (176°F), no hotter (it will be bitter), and no colder (the tea won't blend properly). Pour 40 ml into the bowl containing the sifted matcha. The amount may seem tiny, but it's what will give it that characteristic syrupy texture.

Step 3: Nerikomi (kneading)

This is where everything changes. Instead of whisking vigorously, you'll knead the mixture with your chasen . Imagine you're kneading a precious paste. The movement is slow, circular, almost meditative. The whisk glides against the bottom and sides of the bowl, gradually incorporating the water into the powder to create a smooth, homogeneous paste.

This movement is called Nerikomi in Japanese: literally "kneading and incorporating." There must be no air bubbles, no foam. The surface of the Koicha should be shiny and smooth like a green mirror .

The process takes about 2 to 3 minutes. Breathe deeply. Slow down. This isn't a race; it's a silent conversation between you and the tea.

Step 4: The assessment

When the texture is perfect (neither too runny nor too thick, like warm custard), bring the bowl to your lips. Take small sips. Let the liquid coat your tongue. Close your eyes. Taste the deep umami, that flavor of the dashi broth, mingled with an almost sweet, vegetal sweetness.

Which Matcha should I choose for Koicha?

Here's the truth few dare to say: Koicha is ruthless. While an Usucha might "forgive" an average matcha by diluting it, Koicha amplifies every flaw fourfold.

A culinary or even standard premium matcha ? Undrinkable as a Koicha. The bitterness will be overwhelming, almost metallic. The astringency will dry out your mouth for hours. All the polyphenols, all the raw catechins, stand out like claws when the tea is this concentrated.

Why quality is non-negotiable

Koicha requires matcha of superior ceremonial grade, which the Japanese sometimes call "imperial grade." This level of quality guarantees:

• An exceptional L-theanine content : This amino acid not only provides the characteristic umami, but also a natural sweetness that counterbalances the caffeine concentration (which is effectively doubled in Koicha).
• Prolonged shading : A minimum of 20 to 30 days before harvest. The longer the plant remains in the shade, the more chlorophyll and amino acids it develops, while reducing bitter catechins.
• Noble cultivars : Tea masters favor certain varieties such as Asahi, Samidori, or Gokou for Koicha. These cultivars naturally possess a milder, creamier flavor profile , with buttery notes that are beautifully expressed in thick preparations.
• The first harvest (Ichibancha) : Only the very first leaves of spring, full of nutrients accumulated during the winter, offer the complexity necessary for Koicha.

Why is your Koicha bitter?

If you have ever tried to prepare Koicha and the result was unpleasantly bitter or astringent, know that the problem probably comes not from your technique but from your matcha.

The science behind intensity

The more concentrated a tea is, the more clearly its components are revealed. In a diluted Usucha, the polyphenols (responsible for bitterness) are tempered by the volume of water. In Koicha, with less water for twice the amount of powder, these same compounds become dominant if the tea does not have a sufficient L-theanine content to balance them.

This is why a "premium" matcha for lattes or pastries (perfect for culinary use) becomes a nightmare in Koicha. The leaves haven't been shaded enough, the cultivars aren't suitable, or the post-harvest processing hasn't preserved the delicate amino acids.

Signs of a matcha unsuitable for Koicha

• Immediate bitterness from the first sip
• Astringency that dries out the mouth
• A greenish-yellow color rather than deep jade
• A grainy texture that never really becomes smooth
• Metallic or dried hay aftertaste

The solution: excellence or nothing

The secret to a successful Koicha lies 80% in the quality of the tea used . Don't ruin your experience with a standard matcha. The Koicha ritual already demands so much presence and care that it deserves a tea that lives up to your intention.

A matcha truly crafted for Koicha, like our organic ceremonial matcha, will transform the experience: the taste will be naturally smooth, almost sweet, with a creamy texture that caresses the palate. The umami (that fifth taste comparable to a rich miso broth) will emerge in a crescendo, leaving a lingering finish that will make you want to close your eyes and simply... be.

Discover the excellence of Koicha with Blossom Matcha

Preparing Koicha is a journey to the very essence of matcha, a moment when time slows, the senses fully awaken, and the tea's quality is revealed without artifice. At Blossom Matcha, we understand that discerning tea lovers seek not just a product, but an authentic experience. That's why our Superior Ceremony matcha is cultivated according to the most demanding standards of Japanese tradition, specifically selected to reveal its magic in a thick brew. Every bowl of Koicha prepared with our matcha offers you what centuries of tea masters have sought to preserve: the natural sweetness of umami, the silky texture of a plant-based nectar, and that feeling of complete satisfaction that lingers long after the last sip.