Best Ever Lemon Pie
["1 (9-inch) baked pie shell or a graham cracker crust", "1 1/4 c. sugar", "6 Tbsp. cornstarch", "2 c. water", "1/3 c. lemon juice", "3 eggs, separated", "3 Tbsp. margarine", "1 1/2 tsp. lemon extract", "2 tsp. vinegar"]
["Mix sugar, cornstarch, water, beaten egg yolks, lemon juice and margarine together.", "Cook in a double boiler until thick (about 25 minutes).", "Remove from heat.", "Add lemon extract and vinegar.", "Stir thoroughly and then cool.", "Pour into crust.", "Cover with meringue and brown.", "Serves 6."]
["shell", "sugar", "cornstarch", "water", "lemon juice", "eggs", "margarine", "lemon extract", "vinegar"]