Lemon Orange Frosting

Ingridients

6 cups confectioners' sugar

1 egg yolk

2 tablespoons lemon juice

3 tablespoons orange juice

1 lemon

2 large oranges

1/4 cup butter

Directions

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.