Marble Cake - Marmorkage

• 250 grams butter
• 250 grams sugar
• 4 pieces eggs
• 1 teaspoon vanilla paste or the seed from 1 vanilla bean pod
• 250 grams all-purpose flour
• 1.5 teaspoons baking powder
• 50 milliliters milk
• 2.5 tablespoons unsweetened cocoa powder
• 1 tablespoon cold espresso or another strong coffee

1. Preheat the oven for 355F (180C).
2. Butter a 43/4x9" (12x23 cm) pan. Line the bottom with some parchment paper.
3. In a large mixing bowl, cream the butter and sugars until very light and fluffy, mix in the vanilla paste. Add the eggs one at a time, and mix just until fully incorporated.
4. Sift flour and baking powder in a bowl.
5. Fold in alternately dry ingredients and milk.
6. Pour 2/3 of the batter into the prepared pan. Mix in cocoa and coffee in the last third of the batter, and pour it on top of the white in the pan. Using a knife "cut" in a zig-zag and up'n down motion down the pan to create a marbled effect.
7. Bake the cake for 45-55 minutes until a cake tester inserted into the center comes out clean. Turn out onto a cooling rack and leave to cool.

butter, sugar, eggs, vanilla paste, flour, baking powder, milk, cocoa powder, cold espresso

Taken from food52.com/recipes/35139-marble-cake-marmorkage (may not work)