Lemon Sponge Pie
["3/4 c. sugar", "3 Tbsp. flour", "grated rind of 1 lemon", "4 Tbsp. lemon juice", "1 Tbsp. melted shortening", "2 slightly beaten egg yolks", "1/8 tsp. salt", "1 c. milk", "2 stiffly beaten egg whites", "1 unbaked pie shell"]
["Mix sugar with flour and grated rind; mix with lemon juice, shortening and egg yolks.", "Mix in salt and milk; mix well.", "Fold in egg whites.", "Bake in oven 40 minutes at 375\u00b0."]
["sugar", "flour", "lemon", "lemon juice", "shortening", "egg yolks", "salt", "milk", "egg whites", "shell"]