Pu-erh tea paste: choosing and preparing cha gao

Cha gao (茶膏) is a concentrated tea extract that dissolves in water. You do not need a strainer or a brewing pot. The name “pu-erh resin” refers to its appearance: it is not tree resin.

Cha gao tea resin on display at the Pu’er Museum.
Photo: 瑞丽江的河水 · CC BY-SA 4.0

What you are buying

Tea is extracted with water, the leaves are removed, and the extract is concentrated and dried. Production methods vary; not every paste uses low temperatures or vacuum processing. The flavour depends on the tea and how it is processed. Ripe pu-erh paste may have woody or dried-fruit notes, but these are not features of every cha gao.

What to check

Look for ingredients, a named producer, serving weight, a best-before date and preparation instructions. Check which tea was used and whether sugar or flavourings were added. A glossy surface, dark colour or clear drink does not establish quality. Cha gao is a soluble tea extract. That format alone does not make it better or worse than leaf tea.

How to prepare it

Start with a small serving within the producer’s recommended range and the stated volume of water. Cubes vary in weight and concentration, so “one cube per cup” is not a universal recipe. Use the recommended water temperature, stir and allow it to dissolve before adding more. Dilute with water if the taste is too strong. Do not rinse the paste: you would wash away some of the tea itself.

How to store it

Keep the pack tightly closed in a dry place away from heat and strong smells. Follow its storage instructions and best-before date rather than advice for ageing tea cakes. If it gets damp or develops suspicious growth, do not use colour alone to judge safety or taste it to check.

Questions and answers

Does it contain caffeine?

Yes, unless it is specifically decaffeinated. Without the producer’s data, the amount per serving is unknown. Adding water reduces the concentration, but not the total caffeine if you drink the whole serving.

Can it replace leaf pu-erh?

It is convenient for travel and work, but you lose the changing flavours of successive infusions. Choose it for taste and convenience, rather than promises of “imperial” quality or medicinal effects.