Cocoa powder is bitter and does not dissolve in hot liquid, it clumps and floats. The fix takes thirty seconds and is the whole recipe.
Make a paste first. Cocoa, sugar, cinnamon and salt with a tablespoon or two of cold water, worked with a spoon until it is a smooth dark paste with no dry pockets. Only then add the rest.
- Whisk the milk powder into 450 ml of cold water.
- In the pan, make the cocoa paste with a splash of that liquid.
- Add the rest gradually, stirring, then bring to a bare simmer. Do not boil.
- Chilli flakes in for the last minute, then strain them out or leave them: either is correct.
The salt and the chilli are both doing the same job: stopping it being flatly sweet. A pinch of salt in hot chocolate is not a gimmick, it is what makes the cocoa taste of more.
Serves 2.