A Decoction Made the Night Before Buys You a Two-Minute Morning

Comparisons of making a tea decoction in advance usually pick a winner. This one picks the circumstances, which is more useful.

What a decoction is

A decoction is the water phase of chai taken to roughly triple strength and held without any milk in it at all. South Indian coffee culture has used the same idea for generations, and the logic transfers directly to tea. Because it contains no dairy, it refrigerates safely for two or three days in a sealed jar without any special handling.

Making a glass of chai then becomes a matter of heating milk and adding concentrate, which takes about two minutes. For anyone making chai on a weekday morning under time pressure, this is the single most useful technique available.

Making it properly

Use three times your usual leaf and three times your usual masala for the volume of water you are boiling. Boil for four to five minutes rather than three, since you want full extraction and there is no milk to protect. Strain it twice through a fine mesh, because sediment left in the jar will keep extracting for the whole storage period.

By the second boil, cool it quickly in a shallow dish before it goes into the jar rather than letting it cool slowly in the pan. Fill the jar to the top to reduce the air above the liquid, which slows the oxidation that dulls it.

What keeps and what does not

Colour and strength survive refrigeration almost completely and will still be there on the third day. The volatile aromatics from cardamom, fennel and fresh ginger fade noticeably after the first twenty-four hours. Ginger heat and pepper bite hold up well, which is why a ginger-forward blend suits this method better than a perfume-forward one.

At the stall, the concentrate darkens over time as the tannins continue to oxidise, though this is cosmetic more than anything. Anything that smells sour or looks cloudy rather than clear should be discarded without further debate.

Using it

Heat the milk in a small pan and add roughly one part concentrate to two parts milk, adjusting on the first attempt. Bring it barely to a simmer rather than a boil, since everything that needed boiling has already been boiled. A pinch of freshly crushed cardamom added off the heat restores most of the aroma the storage cost you.

It also makes an excellent iced chai, since cold concentrate poured over cold milk needs no heating at all.

The ratio is the thing to write on the jar, because you will not remember whether you made it triple or quadruple strength.

What you genuinely lose

A cup built from concentrate is flatter in the nose than one built in a pan five minutes earlier. The milk never boils with the leaf, so the fat-soluble spice compounds are extracted less thoroughly.

A drinker comparing the two side by side will pick the fresh one every time without much hesitation. A drinker who has not had the fresh one for comparison will usually find nothing at all to complain about. That gap is the honest trade, and for a rushed weekday it is very often worth taking.

Milk fat, water hardness and hob power shift the result more than the recipe admits.

Scaling it for a household

A litre of concentrate covers roughly ten to twelve cups depending on how strong your household likes them. Make it on a Sunday evening and it covers the working week up to about Wednesday before quality drops. Freezing it in an ice tray extends the useful life to weeks at the cost of a little more aroma.

Label the jar with the date, because a dark liquid in a fridge gives no clue about its age. Households where different people want different strengths benefit more from this method than anyone else does.

Side by side

The takeaway

Boil the water phase on Sunday and the weekday cup becomes a two-minute job.

The best chai you ever had was made carelessly by someone on their ten thousandth pot.