Cha matoom (ชามะตูม) is one of those drinks that is everywhere in Thailand and almost unknown outside it. Amber, naturally sweet, tasting faintly of caramel and dried apple — and made from a fruit most people outside Southeast Asia have never seen.
What bael fruit is
Bael (Aegle marmelos) is a hard-shelled fruit that grows across South and Southeast Asia. In Thailand it is called matoom. The flesh is sliced and sun-dried until the pieces turn amber and firm, at which point they keep for a very long time and are sold in bags in every market.
Dried bael does not look like much — leathery, slightly translucent discs. What it makes is a golden, gently sweet drink that needs no sugar to be pleasant.
The method: simmer, do not steep
This is the one botanical in our range where simmering genuinely beats steeping. The dried slices are dense and firm rather than leafy, and they need sustained heat to soften and release their sugars. A five-minute steep in a mug gives you faintly flavoured water.
For a pot (about 1 litre)
- Use 3–4 dried slices, or about 10g, to 1 litre of water.
- Bring to the boil, then reduce to a gentle simmer.
- Simmer 15–20 minutes, partly covered. The water will turn deep amber and the kitchen will smell faintly of caramel.
- Strain. The softened slices can be discarded, though some people eat them.
- Drink hot, or cool and pour over ice.
Longer simmering makes it darker and rounder rather than bitter — bael is forgiving. Thirty minutes is fine if you like it strong.
The quick version
If you only want a mug: one slice, 250ml, simmered 8–10 minutes in a small pan. It is worth using a pan rather than a kettle and mug.
Sweetening it (or not)
Bael is already sweet, which is the point of it. Many Thai versions add palm sugar anyway, particularly for the iced version, because cold blunts sweetness. Try it unsweetened first — it is one of the few infusions that genuinely does not need anything.
If you do want it sweeter without sugar, add a dried stevia leaf to the pan for the last five minutes of simmering, while it is still hot.
Iced cha matoom
This is how it is most often sold from carts. Simmer it at double strength — 20g to a litre — sweeten while hot if you are going to, chill thoroughly, then serve over a lot of ice. The dilution from melting ice is why the concentrate needs to be strong.
What it tastes like
Warm and gently sweet, with a soft woody depth underneath. The nearest comparisons most people reach for are dried apple, caramel and very lightly toasted grain. There is no sourness, no astringency, and no bitterness at all — it is one of the least challenging things you can put in a cup, which is why it is often the first Thai infusion people take to.