This takes 20 seconds longer to make than using a mix, and it is 10000 times better!
For one serving, if you use a microwave, in a microwave-safe mug, stir these ingredients together thoroughly:
1 ½ teaspoons unsweetened cocoa powder (or more to taste)
2 ½ teaspoons sugar (or more to taste)
A tiny pinch of salt
Add two teaspoons of whole milk and stir until the paste is smooth.
Fill the mug with milk. Stir thoroughly. The mixture will not blend completely.
Microwave for 2 ½ minutes at high power, stir again, and enjoy.
For four servings
In a heavy-bottomed sauce pan, whisk together 1/4 cup cocoa, 1/3 cup sugar, and a sprinkle of salt. Add 2 Tablespoons milk, and stir to a smooth paste. Whisk in 5 cups milk. Heat gently over medium-low heat.