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["Preheat oven to 350u00b0F Grease & lightly flour two 9"" cake pans.", "Combine sifted flour & salt; set aside.", "Put cocoa in small bowl. Gradually add food coloring, stirring until smooth. Set aside.", "With electric mixer at medium speed, cream together shortening & sugar. Beating 5 minutes until fluffy. (Do not shorten shortening/sugar creaming time!).", "Gradually add egg whites, beating for at least 30 seconds after each addition.", "With mixer at low speed, add flour mixture to sugar mixture alternately with buttermilk & vanilla, scraping sides of bowl as necessary.", "Add cocoa mixture. Blend well by hand. Do not beat.", "In small bowl, hand mix vinegar w/ baking soda. Stir briefly to mix, and then fold into cake batter. Do not beat.", "Pour batter into prepared cake pans. Bake 25-30 minutes or until toothpick tests done.", "To make frosting: Combine sugar, water, cream of tartar and salt in saucepan. Bring to boil, stirring until sugar is dissolved & mixture is syrupy.", "While beating with electric mixer, gradually add syrup to unbeaten egg whites in mixing bowl. Do not stop beating until stiff peaks form (about 7 minutes). Beat in vanilla.", "Allow cake layers to cool on rack 10 minutes before turning out, and let cool completely before frosting."]
