Marble cake

This is a recipe contributed by Patrick from his grandma...

Ingredients:

250g (8.8 ounces) margarine
200g (7 ounces) sugar
1 or 2 teaspoons Vanillin powder
3-4 Eggs
(Rum)
Some salt ( be careful with the salt)
500g (17.5 ounces) Flour
1 or 2 teaspoons Baking Powder
About ¼ litres of milk
30g (1 ounce, 2 tablespoons) Cocoa
25g (0.9 ounces) sugar
2-3 tablespoons of milk

Procedure:
Cream [stir] the margarine until it is creamy then gradually add the sugar, vanillin powder, eggs, Rum and salt.

Mix the Flour with the Baking Powder. Add this alternately with the milk while stirring. (The dough shall not be liquid but when lifting some with a spoon it should slowly lose some parts that drop back into the bowl).

Put about 2/3 of the dough into a greased ring-shaped cake baking form.

Mix the remaining 1/3 of the dough with cocoa and sugar and add as much milk so that the consistency is again the same as described above.

Put the dark dough on top of the bright.

To get the marble pattern, you draw a fork spirally through the dough layers.

Put into the oven at 180°C for 75min. For the last 10 minutes turn off the oven and let the dough remain inside.