250g butter softened2 cups sugar6 eggs2 cups flour, sifted2 teaspoons baking powder1 cup sour cream4 teaspoons lemon rindWhipped Cream & Icing Sugar to serve. Line and grease a 25cm spring form tin.Cream butter and sugar together.Add eggs one at a time to the creamed butter and sugar.Fold in flour, baking powder and sour cream.Add lemon rind.Pour batter into the tin and smooth the...