Mix cocoa powder with sugar and a small amount of warm liquid to make a smooth paste before adding the rest of the milk. Dumping dry cocoa directly into a full mug often leaves floating clumps because the powder does not wet evenly.
Start with a small cocoa paste
For one mug, combine about one tablespoon unsweetened cocoa with one to two teaspoons sugar, adjusting to taste. Stir in a tablespoon or two of warm milk or hot water until smooth. Add more liquid gradually only after the dry pockets disappear.

Warm the milk gently
Heat milk until steaming, not boiling hard, and whisk it into the paste in several additions. Gentle heat and continuous stirring distribute cocoa particles more evenly. A small whisk or milk frother helps with stubborn specks.

Understand why powder floats
Cocoa contains fine particles and cocoa butter residues that can resist wetting. Mixing a little liquid in first coats those particles; whisking dry cocoa into a large volume forces you to chase floating islands of powder.
Customize without making the drink gritty
Add a pinch of salt or a little vanilla after the cocoa is mixed. If using melted chocolate as well, keep the liquid warm and stir until the chocolate blends. Unsweetened cocoa powder is different from sweetened hot-chocolate mix, so read the ingredient label.
Frequently asked questions
Can I make the paste with cold milk?
Yes, but room-temperature or warm liquid generally disperses cocoa more easily.
Is a blender necessary?
No. A small whisk and a patient, gradual addition of liquid usually work.
Related reading: why bloom cocoa powder in melted butter.

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