A good Marple cake mix by Dr Oetker Marmor Kucken . Preheat the oven 350F. Place baking mixture, 5.3 oz margarine, 3 eggs, and 3.5 oz milk in a bowl. Mix everything and pour ½ of the dough into a greased loaf-pan (approx. 10 inch by 4.5 inch. Mix the remaining dough with the cocoa powder and 1Tbs. of milk. Layer the light and dark dough in the pan and use a knife to make a marble pattern. Bake the cake for approx. 60 minutes. Cut the center approx.1/2? deep after 15 minutes baking. Let cake stand for 10 minutes after baking, before you take it out of the loaf pan. Let cool down completely before serving. Enjoy!