Beat sugar and butter until you until you've got a smooth mixture. Beat in egg yolks until creamy and smooth. Add in quark and lemon juice and stir until well-combined.
Mix semolina, baking powder and baking soda and add to the butter-quark mixture. Whip the egg whites until they are stiff. Fold into the batter. Carefully add in mango.
Spread the batter into an 8-9 inch greased baking tin and sprinkle almonds on top. Bake at 190C/375F for about 45 minutes.
