Preheat oven to 180º C
Mix butter, sugar and egg yolks until a light and fluffy
Mix dry ingredients in a separate bowl
Add orange juice and the dry ingredients to egg mixture
Beat egg whites until it has little peaks
Mix gently into the cake mixture.
Lay the resulting mixture in the bottom of a greased 20 cm x 20 cm square cake tin
Lay fruit on top of cake mixture
Bake at 180º C for 40-50 minutes until golden. The cake mixture will rise through the fruit layer.
Remove and leave to cool.
Dust with icing sugar