Lemon Sponge Pie
["1 (9-inch) unbaked pie shell", "6 Tbsp. margarine", "1/8 tsp. salt", "1 1/2 c. sugar", "1/3 c. lemon juice (fresh or bottled)", "grated rind of 1 lemon or 1 tsp. dried peel", "3 Tbsp. flour", "3 extra large eggs, separated", "1 1/2 c. milk (whole preferred)"]
["Cream butter, sugar, salt and flour.", "Add egg yolks and lemon juice; beat until fluffy.", "Stir in milk.", "Fold in stiffly beaten egg whites with a wire whisk, gently, until well blended."]
["shell", "margarine", "salt", "sugar", "lemon juice", "lemon", "flour", "eggs", "milk"]