Mix the margarine, sugar and vanilla sugar until foamy, add the eggs and buttermilk and mix well together. Then add the flour, baking soda and salt and mix into a creamy dough.
With an ice cream scoop (so they will all be the same size) put small heaps a few centimeters apart on the baking sheet. Bake for about 12 minutes.
After cooling, mix the powdered sugar with water, milk, lemon juice, soda, rum, etc. and create a topping. So that the Americans smear the underside.