I believe a Chocolate Angel Food Cake has an interesting look; kind of natural, less perfect if you like. It is a type of cake that allows you to eat a big slice with less worries about your waistline, while enjoying the flavors of chocolate
Sift together, cake flour, 1/3 cup cocoa powder, 1/4 cups sugar and ground cinnamon and set aside.
Beat egg whites in a large bowl until foamy. Add cream of tartar and salt and beat until soft peaks. Gradually, add 1 cup of sugar and beat until you have stiff peaks.
Sift flour mixture over egg white, little by little and fold each addition gently until you have a homogeneous batter.
Scoop batter into tube pan or bundt pan, spreading evenly.
Use a knife to 'cut' the air out of the batter.
Place pan in the oven and bake for 45 minutes or until cakes springs back when touched.
Prepare chocolate sauce while cakes is in the oven: combine sugar, milk and cocoa powder and melt in saucepan or in microwave. Stir until smooth and add dark chocolate pieces. Stir again until mixed. Allow to cool.