The characteristic rings that appear when sliced resemble tree rings, and give the cake its German name, Baum kuchen, which literally translates to tree cake. I made this years ago getting the recipe from bon appetit. All ingredients should be room temperature. This is a dense, rich cake so be sure to slice thin. You can always go back for seconds. Optional: Crushed toasted almonds can be scattered on the jam layers. This torte will have between 20-30 layers.