Lemon Filling

• 1 cup sugar.
• 2½ tablespoons flour.
• Grated rind 2 lemons<

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.