Marmorkuchen (German Marble Cake)
Marble cake (Marmorkuchen) has withstood the test of time–is it still one of the most popular birthday cakes in Germany both for children and adults.
Preheat the oven to 350 degrees F (175 degrees C).
Grease a large Kugelhopf or Bundt cake pan with butter.
Beat butter with an electric mixer in a large bowl until light and creamy.
Slowly add sugar and vanilla sugar while beating constantly.
Add eggs 1 at a time beating well after each addition.
Beat for 5 minutes until batter is light and fluffy.
Sift flour and baking powder together in a separate bowl.
Gradually mix flour mixture into the cake batter alternating with the milk.
Add rum and lemon zest.
Pour 2/3 of the batter into the prepared pan.