German Marzipan Cake

1 cup almond paste
3/4 cup margarine
6 tablespoons granulated sugar
4 eggs
1 cup all-purpose flour
1 tablespoon cornstarch
1 teaspoon baking soda

Mix all ingredients together. Put into a greased loaf pan. Bake at 340 degrees F for about 65 minutes. Remove from pan. Let cool. Pour melted chocolate over the top.