Lemon Frosting - cooking recipe

Ingredients

2 sticks butter or margarine
2 Tbsp. self-rising flour
3 eggs, beaten
2 c. sugar
3 lemons, grate the rind of 1 lemon and reserve and squeeze the juice from the 3 lemons and reserve

Preparation

Beat eggs; add sugar and flour and beat again.
Have butter at room temperature and add butter; beat again.
Add reserved lemon juice and rind.
Stir in; do not beat.
Cook in a double boiler until frosting thickens.
Stir frequently.
Let cool.