Kitchen & Food

#16 · Stir hot chocolate to the bottom

Reach the sticky, chocolatey residue at the bottom of a tall mug that a teaspoon simply cannot get to.

Cocoa powder settling into a sludge at the bottom of the mug is not a stirring failure so much as a physics one - and the fix is in how you start, not how hard you stir.

How to do it

1. Put the powder and sugar in the mug first, with just a splash of hot liquid.
2. Work it into a smooth paste with the chopstick before adding anything else. This is the step that matters.
3. Add the rest of the hot milk slowly, stirring as you go.
4. Finish by running the chopstick around the base corner where sludge collects.

Why it works

Cocoa powder is hydrophobic - it is about 20% fat, and fat repels water. Dumped into a full mug, the grains clump and the outside of each clump wets while the inside stays dry powder. Making a paste first wets every grain individually while there is not enough liquid for clumps to form, which is the same reason you make a roux or a custard the way you do.

Tips & warnings

• The same technique fixes lumpy gravy, custard and matcha.
• A chopstick reaches the square corner at the base of a mug that a spoon curves away from.
• It is also silent, which at six in the morning is not nothing.