Lemon Orange Frosting - cooking recipe

Ingredients

6 cups confectioners' sugar
1 egg yolk
2 tablespoons lemon juice
3 tablespoons orange juice
1 lemon
2 large oranges
1/4 cup butter

Preparation

Beat the butter until it has the appearance of thick cream, stir in confectioners sugar, a little at a time, and continue working until mixture is very smooth. Beat in egg yolk and lemon juice. Stir in enough orange juice to make a spreadable frosting, then add grated rind of 1 lemon and 2 grated orange rinds. Spread on sides and top of cake.