Whisk the eggs with the sugar. Add the mayonnaise, sour cream, baking powder and melted margarine, then whisk in the flour until you have a smooth batter.

Divide the batter into two equal parts and stir the cocoa into one of them.

Grease the pan with vegetable oil. Spoon the batter into the center of the pan one tablespoon at a time, alternating: light, then dark on top of it, then light again, and so on to the end.

Bake in an oven preheated to 190 °C for 30 minutes. Check for doneness with a skewer - it should come out dry.

Let the finished cake cool and decorate to taste with chocolate fudge, shredded coconut and almond flakes. Enjoy your meal!