Grandma’s Lemon Sponge Pie

1 lump butter, the size of a walnut
3 tablespoons flour heaping
1 cup sugar
1 lemon, including rind (juice and grind)
2 egg yolk
2 egg whites
1 cup milk

Cream the sugar and butter together. Add flour, lemon juice, rind and yolks. Stir well and add milk. Beat egg whites to a stiff consistency and fold into mixture. Pour into unbaked pie shell and bake at 400 degrees for 10 minutes or 315 degrees for 35 minutes, or until done. Makes one 9 inch pie.