5 eggs, separated
1 1/2 c. sugar
1 1/4 c. pastry flour, sifted
1 tsp. vanilla
1/2 tsp. grated lemon rind

Place egg yolks and sugar in mixing bowl and beat until lemon colored. Add flour, a little at a time, blending in well. Add vanilla and lemon rind. Beat egg whites until stiff but not dry and fold into cake mixture. Butter and flour a cake pan about 8 inches square. Pour in cake batter and bake in oven at 375 degrees for 40 minutes. Turn over on cake rack and cool.