A sachet is mostly sugar and dried glucose syrup. This is cocoa, and it is a different drink.
Make a paste first. Cocoa tipped into hot milk floats in lumps and stays there. Cocoa, sugar, salt and cornflour mixed with two tablespoons of cold milk into a smooth dark paste takes twenty seconds and fixes it permanently.
- Dry things in the pan, mixed. Two tablespoons of the cold milk worked in to a paste.
- The rest of the milk in gradually, stirring.
- Medium heat until it steams and just begins to move. Do not boil it: boiled milk catches on the base and tastes of it.
The salt and the cornflour are both doing real work. The salt makes it taste more of chocolate, the way it does in baking. The 3 g of cornflour gives it the body that a sachet gets from thickeners, and without it a cocoa drink is thin.
Sweeten to taste at the end rather than at the start. 25 g for two mugs is restrained by commercial standards and about right for actual chocolate.
Serves 2.