Step 1: Assemble ingredients
1/4 cup unsweetened cocoa
1/4 cup hot water
1 stick (1/2 cup) butter, softened
1/3 cup sugar
1 egg (beaten)
1 tsp vanilla extract
2 cups flour
Preheat the oven to 350 degrees.
Step 2: Dissolve cocoa, cream butter and sugar
In a large mixing bowl, cream the butter and the sugar. This'll be easier if your butter is pretty soft -- you can warm it up in the microwave if you like. You can use either a wooden spoon or an electric handmixer (I just used a spoon).
By now, the cocoa should be fully dissolved in the water and warm, not hot. Add it to the butter mixture and stir well.
Step 4: Add flour gradually
Step 5: Form a choco-log, refrigerate
With your hands, form the dough into a log about 10 inches long and 2 inches in diameter. Roll it up in wax paper to cover it and place it in the fridge for about 30 minutes or until it's firm enough to handle.