Why is my chai bitter, and how do I fix it?

Almost always because it was boiled too long. The compounds that make tea taste good come out in the first two or three minutes; the harsh, drying ones come out after that. Ten minutes on the flame does not make chai stronger, it makes it bitter. The second most common cause is too much tea used to compensate for a method problem.

Bitter chai is the most common complaint we hear, and in almost every case the person describing it is doing one of three things. None of them is buying the wrong tea.

Why is my chai bitter?

You boiled it too long

Extraction is not linear and this is the whole of it. Tea gives up its good qualities early: colour, briskness, aroma, body, all in the first two to three minutes after the milk goes in. Tannins keep coming out long after that, and tannins are what dry your mouth and sit at the back of your throat.

A pot left on the flame for eight or ten minutes has stopped getting stronger and started getting harsher. If your chai is bitter and you are boiling it for a long time because you want it kadak, you are working against yourself.

Two to three minutes after the milk. Stop when it turns a deep reddish brown.

The numbers

What comes out of the leaf, minute by minute, after the milk goes in

Time on the flame	Colour, body, briskness	Bitterness	Net result
1 minute	Most of it, already	Barely any	Thin but clean
2 to 3 minutes	Essentially all of it	Still low	The cup you want
5 minutes	No further gain	Climbing	Harsher, no stronger
8 to 10 minutes	No further gain	High	Stewed

You used more tea to fix a weak cup

This is the second mistake and it follows the first. The cup tastes thin, so you add more patti, and now it is thin and bitter instead of just thin.

Weakness is usually a method problem, not a quantity problem. If the tea did not boil in plain water before the milk went in, it never opened properly, and no amount of extra leaf fixes that.

You added the milk too early, then compensated

Milk proteins coat the granules and blunt extraction. Tea that goes into milk from cold has to be boiled far longer to give any colour at all, which takes you straight back to the first problem.

Plain water first, hard boil, one full minute. Then milk.

Bitter, astringent and strong are three different things

Worth separating, because they get treated as one and they have different causes.

Depth of colour is not the same as strength either. A cup can be very dark and taste of nothing, which is what happens when a poor tea is boiled hard to force colour out of it.

Other causes worth checking

Reheating. Chai reheated is chai boiled twice, and it always comes back bitter. Make less rather than reheat.

Leaving the leaf in. If you make a pot and let it sit with the tea still in it, extraction continues in the pan. Strain it as soon as it is done, even if you are not drinking it immediately.

Too much ginger. Ginger has its own bite and it is easy to mistake for the tea being harsh. If your chai turned bitter around the time you started adding more ginger, try a cup without it.

Old, badly stored tea. Tea that has gone flat loses its aroma first and its sweetness next, and what is left reads as harsh. If a cup smells of nothing and tastes rough, the problem is the pack, not the pot.

The fix, in order

1. Cut the boiling time after the milk to two to three minutes.
2. Boil the tea in plain water for a full minute before the milk goes in.
3. Go back to a level or heaped teaspoon per cup, not more.
4. Strain as soon as it is ready and drink it hot.

Do those four in that order and change one thing at a time. Most people find it is fixed by the second step.