Restaurant DNA
Sauce reduction and mounting with butter
Reducing concentrates flavour and body; whisking in cold butter at the end gives a glossy, rounded sauce.
Reduction
Simmering a liquid uncovered evaporates water and concentrates everything else: flavour, gelatin, sugars and salt. Restaurants reduce stock and wine for pan sauces, often deglazing the browned fond from the pan first. Because salt concentrates too, sauces are seasoned at the end, not the start.
- Wide pans reduce faster than deep ones
- Taste as you go; stop when the sauce coats the back of a spoon
- Skim fat and scum for a clean, glossy sauce
Mounting with butter (monter au beurre)
Cold butter is whisked or swirled into a reduced sauce off the heat or over low heat, a few pieces at a time. The butter's fat is dispersed as tiny droplets held in the sauce (an emulsion), making it glossy, slightly thicker and rounder in flavour. If the sauce boils afterwards, the emulsion breaks and the fat separates.
Indian finishing: butter, cream and kasuri methi
In many restaurant-style North Indian gravies (makhani-type dishes are the best-known), the sauce is finished to order with butter and cream, and crushed kasuri methi is rubbed between the palms and stirred in for its savoury, slightly bitter, maple-like aroma. Butter and cream round off tomato acidity and spice heat. This finishing is what often separates the restaurant taste from home versions, which tend to use less fat.
Bring it home
- Make a quick pan sauce: deglaze with stock or wine, reduce by half, take off the heat, swirl in 1–2 tablespoons of cold butter.
- Do not boil a sauce after mounting it with butter.
- For restaurant-style curry, finish with a knob of butter, a splash of cream and a pinch of crushed kasuri methi in the last minute or two.
- If you want less fat, finish with a little cream or yoghurt only, tempered first so it does not split.
Related techniques
These lessons describe widely used professional practice. They are not any restaurant’s proprietary recipes or methods.