A bowl of koicha leaves nowhere for weak matcha to hide. The tea is dense, unsweetened, and made with far less water than a standard serving. That makes it a useful tasting method for café teams and buyers as well as a traditional preparation. This guide explains the ratio, the slow mixing technique, the sensory checks, and the buying questions that matter when a powder will be served thick.
1. What is koicha matcha?
A thick preparation with a clear purpose
Koicha means “thick tea.” Matcha powder and a small amount of warm water are worked into a smooth, glossy liquid with a consistency closer to a loose paste than to ordinary brewed tea. You drink the whole suspension. There is no straining step and no milk or syrup to cover defects. A conventional bowl of usucha, or thin tea, uses less powder relative to water and is whisked to make a fine foam. Koicha is mixed more slowly and usually has little foam.
The preparation serves a practical purpose for a buyer: it magnifies texture, bitterness, sweetness, aroma, and lingering finish. Two powders that seem similar in a sweet latte can behave very differently as koicha. A coarse grind may leave a sandy sensation. A stale lot may smell flat before it reaches the tongue. A harsh tea can become tiring after one small sip. None of that means koicha is a universal quality test; it means the method exposes traits that a diluted drink can conceal.
2. How much powder and water should a team use?
Start with a ratio that can be repeated
Ippodo’s koicha recipe uses 4 g of matcha and 30 mL of water at 80°C. It calls for sifting the powder and mixing slowly for roughly 15 seconds. That is a useful starting point, not a rule that every powder must obey. A different bowl, grind, or customer preference may call for a small adjustment. Write down the actual weights and temperature each time; “two scoops” varies too much between operators to support a supplier comparison.
Prepare a reference bowl before changing any variable. If the tea feels overly dense, add a few measured milliliters of water instead of pouring freely. If it tastes thin, measure the next powder dose rather than stirring more aggressively. Serve the samples at the same interval after mixing. Koicha thickens as it cools, so a warm sample and a five-minute-old sample will not tell the same story.
| Trial | Matcha | Water | Water temperature | Purpose |
|---|---|---|---|---|
| Reference | 4 g | 30 mL | 80°C | Compare lots on one standard |
| Slightly looser | 4 g | 35 mL | 80°C | Test drinkability without changing dose |
| Lower dose | 3.5 g | 30 mL | 80°C | Test intensity and ingredient cost |
Treat these as tasting trials. They are not validated commercial recipes or evidence that one ratio is inherently superior.
3. Which equipment changes the result?
Use tools that remove avoidable noise
A small scale, thermometer, fine sifter, chawan, and sound bamboo whisk make the comparison easier. The sifter breaks compacted powder before water reaches it. A scale prevents two people from creating different concentrations while believing they followed one recipe. The bowl needs enough room for the whisk tips to move without scraping hard against its sides. The whisk should be clean and flexible; broken tines can make a thick sample gritty and may shed fragments.
Clean each bowl and whisk between lots. If a fragrant sample leaves residue, the next powder may inherit an aroma it does not have. Use neutral water throughout a tasting session and record its source. Water with a strong mineral or chlorine note can confuse a sensory comparison. A café does not need ceremonial theater for an internal test; it needs a repeatable setup. When koicha enters service, the same setup becomes a training aid for staff who must produce the same texture during a busy shift.
4. How should koicha matcha be mixed?
Slow strokes build a smooth surface
Sift the weighed powder into a dry bowl. Pour just enough warm water to wet it and move the whisk slowly through the mixture until dry pockets disappear. Add the remaining measured water and continue with deliberate strokes. For thin matcha, staff often whisk briskly to build foam. With koicha, that motion can fling liquid up the bowl and introduce bubbles that obscure the glossy texture you want to inspect. Ippodo describes a slow back-and-forth motion, which fits the aim here.
Look at the sides of the bowl before serving. A dry green ridge or a concentrated lump means the sample was not fully mixed. Scrape it in gently, then stop. Continuous whisking is not a fix for poor dispersion. If lumps recur, compare sifting, water addition, and powder condition in separate trials. A photograph taken from the same angle can help a team agree on what “smooth” means, though tasting remains necessary.
| Visible result | Likely process question | Next controlled test |
|---|---|---|
| Dry specks | Was powder sifted and wetted evenly? | Sift a second weighed sample |
| Large bubbles | Was the whisk moved too quickly? | Repeat with slower strokes |
| Dull, stiff paste | Is the water dose too low for this powder? | Add 5 mL in the next trial |
| Gritty finish | Is the grind coarse or is powder clumped? | Compare a fresh lot at the same ratio |
5. What should the finished tea taste and feel like?
Separate intensity from defects
Koicha should be concentrated; intensity alone is not a fault. Judge aroma before sipping, then note the first impression, body, bitterness, astringency, and finish. A pleasant bowl can carry strong umami and a persistent tea character without tasting burnt or sharply drying. The exact profile depends on leaf material and blend. Avoid treating bright green color as a complete quality verdict. Color is useful, but it cannot reveal a rough texture or an unpleasant aftertaste.
Tasting in a small panel helps when purchasing for a business. Give panelists identical portions with coded lot numbers. Ask for plain descriptions rather than a single “good/bad” vote: smooth or gritty; sweet or sharp; fresh or flat; clean or lingering bitterness. Repeat the strongest candidates on another day. A powder can win one tasting because the room, water, or preceding sample changed perception. If a buyer intends to use the same tea in lattes, run a separate milk test. Koicha reveals the powder itself; it does not predict every formulation outcome.
6. Which powders deserve a koicha trial?
Screen by the intended service, then by evidence
Start with powders offered for drinking straight rather than assuming that any green culinary powder will make a good thick bowl. Ask a supplier for a recent sample, lot identification, ingredient declaration, origin information, and the relevant safety documents for your market. Taste the sample as koicha, then test the same lot in the exact cup format you plan to sell. A tea with an elegant thick preparation may be wasted in a heavily sweetened drink; a less expensive lot may be a better fit there.
Keep the business calculation separate from the sensory score. At 4 g per bowl, a 100 g pack yields about 25 theoretical servings before handling loss. Multiply the actual powder price by dose and add labor, packaging, and waste. Koicha may be a premium service with a small audience rather than a high-volume menu item. A supplier should be able to support consistent repeat lots if the product is going onto a permanent menu. Verify this through samples and records rather than relying on a grade name alone.
| Buyer question | Why it matters for koicha | Evidence to request |
|---|---|---|
| Can the same profile be supplied again? | Thick tea exposes lot differences | Lot samples and specification |
| How was the powder packed? | Air and light can dull aroma | Packaging format and date code |
| What tests are available? | Food businesses need documented controls | Current COA and relevant certificates |
| What is the real serving cost? | Dose is high relative to usucha | Price, yield, and handling loss |
7. How can a café put koicha on its menu?
Write a service specification before training staff
Define portion size, vessel, water dose, temperature, mixing time, and the maximum interval between mixing and serving. Then run the full process with the people who will actually make the tea. A recipe that works during a quiet tasting can fail in a crowded bar if the whisk, scale, or hot-water source is too far from the station. Staff should know how the finished tea looks and how to handle a lumpy bowl: remake it rather than thinning it without a record.
Explain the small serving to guests. Koicha is concentrated and is meant to be sipped slowly; presenting it in a large takeaway cup sets the wrong expectation. Menu wording can describe texture and flavor without promising health effects. If a café offers both koicha and usucha, the distinction should be visible in service language and price. Charge for the measured tea dose and the labor required, not for a vague “ceremonial” label. A short staff tasting before launch can prevent inconsistent descriptions across shifts. Teams adding a thin-tea option can use this matcha service guide as a separate training reference.
8. What usually goes wrong in a first pilot?
Diagnose one variable at a time
Teams often blame the powder when a bowl turns out unpleasant. Sometimes the tea is at fault; sometimes the water, handling, or expectation is. Water that is too hot for a particular lot may make a sharp edge more obvious. Incomplete sifting can create dense lumps. A tasting panel that has just sampled sweetened lattes may call any unsweetened koicha bitter. Build the pilot so each of those causes can be checked without guessing.
Set a baseline, then change one thing. Compare two water temperatures with the same lot and ratio. Compare sifted and unsifted powder at one temperature. If a sample looks brownish, open a fresh sealed unit from the same lot before declaring the blend unsuitable. Record outcomes even when they are negative. A rejected lot can still teach the team which specification to request next time. The point is a decision supported by a repeatable test, not a perfect-looking bowl for a photograph.
| Problem | First check | Do not assume |
|---|---|---|
| Harsh finish | Water temperature and powder dose | The cultivar alone caused it |
| Sandiness | Sifting, freshness, and grind | More whisking will cure it |
| Flat aroma | Seal integrity and storage | A darker bowl will fix it |
| Inconsistent shifts | Weighing and station layout | Staff need only more practice |
9. How should the powder be stored and handled?
Protect the sample you approved
Matcha has a large surface area exposed to air, so purchasing a good lot is only the start. Keep unopened stock sealed according to the supplier’s instructions and away from heat, moisture, and light. Once opened, date the container, use a clean dry scoop, and close it promptly after each dose. Avoid transferring powder into an unlabeled display jar for convenience. A jar beside an espresso machine may look attractive while subjecting the tea to warmth and repeated opening.
Set a practical use window with the supplier and verify it in your own operation. The best time limit depends on packaging, storage, and sensory requirements; a universal number would be misleading. Taste an opened container periodically against a retained sealed sample when possible. If a customer-facing koicha becomes dull or harsh before the nominal shelf-life date, do not serve it merely because the date has not passed. Record the lot and storage conditions so the supplier can investigate a repeated problem.
10. What should a buyer decide before placing an order?
Turn the tasting into a purchase brief
Choose the powder only after a blind koicha tasting, a service rehearsal, and a check of supply documents. The purchase brief should state the target dose, texture, flavor notes, acceptable color range, pack size, expected monthly use, and the records required with each shipment. If the business also makes lattes, specify whether one powder must serve both purposes or whether separate grades are allowed. This prevents a premium straight-tea result from being mistaken for a complete menu solution.
Ask for a production sample from the lot that will be supplied, not merely a marketing sample from another batch. Compare it with the approved reference at the same ratio. If differences are material, pause the order and discuss options. Matcha Village’s project materials describe bulk matcha and custom blends; request current product and certification documents for the particular lot before citing them in a buyer specification. End the test with a decision: approve, revise, or reject, with a reason that another buyer can understand.
| Decision item | Minimum record | Approval question |
|---|---|---|
| Sensory | Coded tasting notes | Would we serve this unsweetened? |
| Recipe | Weight, water, temperature | Can each shift repeat it? |
| Supply | Lot and lead time | Can we buy the same profile again? |
| Compliance | Current lot documents | Do the records meet our market needs? |
| Economics | Cost per served bowl | Does the menu price support the dose? |
FAQ
Q1: Is koicha matcha the same as ceremonial matcha? No. Koicha names a preparation method. “Ceremonial” is a commercial grade term whose meaning can vary by seller. Judge the actual powder in a thick preparation.
Q2: Does koicha need a foamy top? No. Slow mixing aims for a smooth, glossy surface with little foam. Large bubbles can make texture harder to assess.
Q3: Can a café use latte powder for koicha? It can test it, but a powder that works under milk and syrup may taste rough or thin without them. Run a separate straight-tea trial.
Q4: How much matcha is in one bowl? A common starting point is 4 g with 30 mL of water. Weigh both and adjust deliberately after tasting.
Q5: What should a buyer ask a supplier for? Request a current lot sample, specification, ingredient and origin details, relevant quality documents, pack format, and lead-time information.
Koicha makes a strong supplier comparison because it leaves the powder exposed. Use a fixed ratio and record each change, then judge the lot in the actual service setting. Buyers who need a sample for a thick-tea program can send Matcha Village the target profile, serving dose, expected volume, and required documents so the proposed lot can be tested against a clear brief.