Step 1

In the bottom of a pitcher, whisk cocoa powder and a spoonful of cream into a paste. Slowly, whisking the whole time, add more cream a spoonful at a time until the paste is smooth and loose enough that you can whisk the rest of the cream in larger splashes. Once all of the cream is in, whisk in condensed milk, whiskey and vanilla. Cover with lid or plastic wrap and keep in fridge for up to two weeks, possibly longer.

Step 2

Serve in a tiny tumbler filled with ice, or splashed into coffee.