In short: Batch once; pour and steam each latte without per-drink whisking. Start with a 1:3 matcha-water ratio, water around 80 °C, and about 2 tsp of syrup per latte. Refrigerate and use within three days under general prepared-food guidance.
A note on the numbers: Treat the ratio, water temperature and per-latte dose as practical starting points. They are cafe-service conventions reviewed for accuracy by Erin Young, not measured standards. Adjust the strength to your menu; follow the separate storage limits from Australian food-safety authorities, cited at the foot of the page.
What you need for a cafe matcha syrup batch
Everything here is already behind your bar, apart from the matcha.
| Ingredient | Amount |
|---|---|
| Matcha powder | 1 part, measured by teaspoon |
| Hot water, about 80 °C | 3 parts, measured by teaspoon |
| Honey or sugar | to taste |
You will also need:
- A whisk, milk frother or stick blender — whatever you already use
- A squeeze bottle or sealed jar with a lid
- A label and a pen
Start with 1 part matcha to 3 parts hot water by teaspoon, then sweeten to taste. Tune it to your house strength, and make only the volume you expect to sell.
Date the label before the bottle goes into the fridge. That gives the next shift a clear call on whether the batch stays or goes, because its usable life starts when it is made.
How to make matcha syrup, step by step
- Sift the matcha. Push the powder through a fine sieve into your jug. Matcha clumps, and a clump that survives the whisk will sit in the bottom of the bottle instead of in the drink.
- Heat the water, then let it cool slightly. You want it around 80 °C. Off the boil for a minute is close enough without a thermometer.
- Wet the powder first. Add a splash of the hot water and work it into a smooth paste before the rest goes in. This is the step that decides whether the batch is smooth or gritty.
- Whisk in the rest to ratio. Work to 1 part matcha against 3 parts water, measured by teaspoon. Keep going until the surface is even and there is no sediment dragging round the bottom of the jug.
- Sweeten to taste. Stir in honey or sugar while the syrup is still warm so it dissolves cleanly. Set the sweetness to your house palate: the sweetener is there for flavour and does not make the batch last longer.
- Cool it fast, then bottle and label it. Get it into the fridge rather than letting it sit on the bench cooling down. Write the date on the label before it goes in.
Keep the ratio the same as you scale the batch. Make only what you can sell before the storage limit is up.
Want it unsweetened? The matcha concentrate method
If your menu sweetens to order, or you pour a lot of unsweetened matcha, run a concentrate instead. It is the same job without the sugar.
Work to about 2.5 g of matcha per 30 g of water. It is worth weighing rather than spooning if you are making volume. The method is identical to the syrup: sift, wet the powder into a paste and whisk out to ratio. Cool it fast, then bottle and label it.
Use the same water temperature for concentrate: around 80 °C, off the boil.
Syrup and concentrate keep for the same make-ahead window under general prepared-food guidance. Choose syrup if sweetness is fixed at batch time, or concentrate if each drink is sweetened to order. If you want the per-cup version rather than the batch, our matcha latte method covers it.
How long does the batch keep, and when do you tip it out?
The answer: A refrigerated batch gives you a three-day service window. Use it within that window under general prepared-food guidance applied to prepared perishable food, not matcha-specific testing.
Australian prepared-food guidance puts refrigerated leftovers at 2 to 4 days, so the three-day limit stays on the conservative side.
Hold the fridge at or below 5 °C. Check it with a thermometer rather than trusting the dial, because the dial is a setting and the thermometer is a measurement.
Safe holding temperatures are 5 °C or colder or 60 °C or hotter. Between those temperatures, bacteria multiply fastest.
That clock is cumulative, and this is the part that catches cafes out. Under 2 hours out of the fridge in total, the batch goes back in. Between 2 and 4 hours in total, use it now and do not return it. Past 4 hours in total, throw it out. Every stint on the bench adds to the same total across the day; putting the bottle back in the fridge does not reset anything.
| Situation | What to do |
|---|---|
| Batch in the fridge, cold | Use within three days |
| Fridge temperature | At or below 5 °C, checked with a thermometer |
| Bottle out on the bench, under 2 hours total | Return it to the fridge |
| Bottle out 2 to 4 hours total | Use it now, do not return it |
| Bottle out beyond 4 hours total | Throw it out |
| Milk mixed into the batch | Never; add cold milk to order |
Table limits: The three-day window is general prepared-food guidance, not matcha-specific testing. The fridge and bench-time limits follow Australian food-safety guidance. Add milk per drink; premixed milk follows the same clock.
Syrup or concentrate — which should you run?
Choose based on your menu, not the fridge. Both formats use the same three-day window under general prepared-food guidance. Keep either one at or below 5 °C. Sugar preserves food when it lowers water activity, as it does in jam and honey. This matcha syrup is nowhere near jam concentration, so sweetening changes the flavour, not the storage time.
| Syrup | Concentrate | |
|---|---|---|
| Sweetened | Yes, to taste | No |
| Working ratio | 1 part matcha : 3 parts water, by tsp | About 2.5 g matcha : 30 g water |
| Sweetened to order? | No, it is set at batch time | Yes |
| Fridge life | Three days | Three days |
Ratios are cafe-service convention, not measured optima. Both formats carry the same general prepared-food limit, not a limit measured on matcha.
In practice the menu decides it for you. If most of your matcha goes out sweetened the same way, syrup is fewer moves at the bar: one pour, one jug of milk, done. If you pour a lot of unsweetened, or your customers set their own sweetness, concentrate keeps that decision at the cup where it belongs — otherwise you end up running two syrups.
Either way, the whisking is done before service. The matcha is already dissolved when the order comes in, which is what makes the batch worth making.
How do you pour a latte from the batch?
Start with about 2 tsp of syrup in the cup, then add frothed hot milk. Taste a few and adjust the dose to suit your menu.
Keep the milk routine familiar. Steam or froth it as you would for a flat white, using the same jug and texture target. It gives staff a routine they already know through a busy shift.
Because the matcha was dissolved at batch time, staff can build the order like any other milk drink without stopping to break up powder in the cup.
Swirl the bottle before each pour. Matcha sits in suspension rather than dissolving away to nothing, so it settles between orders — skip the swirl and the first lattes of the shift pour thin while the last ones pour muddy. A squeeze bottle is worth the bench space for exactly this reason: one hand, no spoon, nothing dipping back into the batch between drinks.
Keep the bottle in the fridge and treat it the way you treat milk — out for the pour, back in straight after. Bench time is cumulative across the whole day, so a bottle parked beside the grinder through a morning rush spends the batch's clock for nothing.
Once you land on a dose you like, write it on the bottle next to the date. The whole point of batching is that every shift pours the same drink, and a dose that lives in one barista's head is a drink that changes on their day off.
The same syrup goes over ice: about 2 tsp stirred into cold milk or water over ice.
For the single-cup method, including the paste step this batch replaces, see how to make a matcha latte. For iced service in detail, see our iced matcha latte method.
Why does matcha taste bitter — and the fix
The water may have been too hot. Boiling water scorches matcha and makes it taste grassy and bitter, which is why the batch uses water around 80 °C rather than a fresh boil. That temperature is about flavour, not safety: it has nothing to do with how long the batch keeps.
The other usual suspect is undissolved powder. Sifting first and wetting the powder into a paste before the rest of the water goes in does most of the work.
You will also see the "30-20-10 rule" quoted: 30 seconds to dissolve, 20 to build foam, 10 to smooth. It is a convention circulated by matcha retailers, and it describes a single bowl. If you are batching, it does not apply: you are whisking volume, not one serve, and you whisk until the jug is even.
Matcha for cafe service — what Zen supplies
Zen Green Tea supplies bulk and wholesale Japanese matcha to Australian cafes; our current wholesale count is 200+ Australian hospitality businesses. We have specialised in matcha since 2012.
Use the same Premium Grade matcha for a batch or a single bowl. Set your house strength with the dose, measured by teaspoon.
Your house dose also sets the caffeine in each drink. Matcha provides roughly 57–64 mg of caffeine per 2 g, or about one level teaspoon. At 1 tsp, a latte works out near 60–66 mg, calculated from the powder dose rather than measured in the drink. At 2 tsp, it works out near 115–130 mg on the same calculated basis. More detail sits on our matcha caffeine page.
Making one at home instead?
Batching earns its keep when you are pouring matcha all day. At home, it leaves you with syrup to finish inside three days.
Start with the single-cup matcha latte method instead, or the iced version. If you are chasing a particular cafe's drink, we have pulled apart the Starbucks matcha latte too.
Matcha syrup FAQ
How long can matcha syrup or concentrate be kept in the fridge? Three days, refrigerated. Under the same general prepared-food guidance, both formats get that limit; it was not measured on matcha. Keep the fridge at or below 5 °C. Label the bottle with the date you made it.
Can you batch a matcha latte with the milk already in it? No. Batch the matcha and add cold milk to order. Milk is perishable, so a pre-mixed latte follows milk's handling rules. Time out of refrigeration is cumulative: under 2 hours, return it to the fridge; from 2 to 4 hours, use it immediately; after 4 hours, discard it.
How much matcha concentrate goes into one latte? Pour about 30 g of finished mix per serve and top with milk. The batch ratio is about 2.5 g matcha per 30 g water. Size the batch for expected sales within the three-day general prepared-food limit.
What water temperature should you use for matcha? Around 80 °C, off the boil. Boiling water scorches the powder and turns it bitter. It does not make the batch safer or make it keep longer.
What is the 30/20/10 rule for matcha? Thirty seconds whisking to dissolve, 20 to build foam, 10 to smooth the surface. It is a convention circulated by matcha retailers, not an official standard, and it describes making a single bowl. For a syrup batch, whisk until the jug is even instead.
How much caffeine is in a matcha latte? Roughly 60–130 mg, depending on whether the cafe uses 1 or 2 tsp of matcha. That range is computed from the powder dose rather than measured in the cup. The powder itself carries about 57–64 mg per 2 g serving. For the health questions around matcha, see our matcha health benefits page.
About this recipe
Written and reviewed for accuracy by Erin Young, founder of Zen Green Tea, sourcing matcha directly from Japanese farms since 2012.
Buying matcha for a cafe? Zen's current wholesale count is 200+ Australian hospitality businesses, and it has specialised in matcha since 2012. See wholesale matcha.
Sources
- NSW Food Authority — refrigerated leftovers guidance applied to a prepared perishable batch
- FSANZ — the 5–60 °C temperature danger zone and the cumulative 2-hour/4-hour rule for ready-to-eat potentially hazardous food
- healthdirect Australia — fridge setpoint and danger-zone handling
- healthdirect Australia — refrigerated leftovers guidance
- EFSA — refrigeration setpoint guidance citing WHO
- U.S. FDA — refrigeration principle
- U.S. FDA — milk as a perishable food
- Mayo Clinic — refrigerated leftovers window
- PubMed — water activity as a hurdle to microbial growth
- Institute of Medicine — water activity as a preservation mechanism
- CSIRO — water activity in Australian food preservation practice
- PMC — matcha caffeine per gram, used to estimate the latte figure from the powder dose