Stir margarine until foamy, stir in sugar. Add the egg yolks, then the remaining ingredients and work into a smooth, creamy dough. Beat egg whites into snow and fold into the batter.
Bake in a prepared wreath form (grease and sprinkle with breadcrumbs) for 60 minutes at 160 ° C (make a stick test).
Let the cake cool down and cover with chocolate icing.