Let's start with the fact that brew ground coffee in 50 ml of boiling water, the cooking time of the test (10-20 minutes).

In a separate bowl whisk together melted butter and granulated sugar until smooth. Still whisking, add one egg. Stir until lumps disappear.

Separately mix flour with baking powder and sift into the egg mixture. Mix thoroughly and divide into 2 parts. In one part add cocoa (or grated chocolate), coffee, spices - stir. The second reserve "without additives". Spread in greased with butter the form of alternately light and dark masses - there is turn on the imagination! Sprinkle with walnuts.

Send the cake on the "cakes" to bake for 45 minutes. In the oven it turns out not worse

PS: not to worry, will not burn if cake dramatically "spin" the shape clockwise a couple of times, before heading to the oven/ slow cooker. On the main photo - cake with cocoa in the recipe with bitter chocolate, grated. Voila! Bon appetite!