Orange Cake

100g butter, juice of 2 oranges and grated peel (not pith- the white part that is bitter), 100g ground almonds, 250g flour, 2 tsp baking powder, 2 egg whites beaten until frothy, 1/2 tsp. salt.
Mix all ingredients slowly, adding the eggs last, pour into a buttered baking pan, bake in 200 C preheated oven for 45 min.
When cooked add warm orange marmalade on top, let cool and serve.