Lemon Sponge Pie

Mix the sugar and flour together and add the lemon juice and rind, slightly beaten egg yolks, butter and salt.

Stir in the milk and mix well.

Beat the whites until stiff and fold into the first mixture.

Pour into 9-inch unbaked pie crust.

Bake in hot oven (425°) for 5 minutes.

Turn oven back to 350° and bake until the mixture will not adhere to the point of a knife inserted in the center or about 25 minutes longer.