1 egg
1 teaspoon butter
Mix sugar and flour, add grated rind, lemon juice, and egg slightly beaten. Put butter in saucepan; when melted, add mixture, and stir constantly until boiling-point is reached. Care must be taken that mixture does not adhere to bottom of saucepan. Cool before spreading.
Orange Filling
½ cup sugar
2½ tablespoons flour
Grated rind ½ orange
¼ cup orange juice
½ tablespoon lemon juice
1 egg slightly beaten