Preheat oven to 350 degrees Fahrenheit and line 12-cup muffin tin with cupcake papers. Mix together flour, cocoa, and salt and set aside. Whisk together oil, applesauce and sugar until well combined, then add egg substitute gradually, mixing well. Stir in food coloring and vanilla, then add fat-free buttermilk (to make your own see Low-Fat Cooking Tips) and flour alternately, beginning and ending with flour. Separately, mix vinegar and baking soda and allow to fizz, then fold in, stirring just until combined. Pour into cupcake papers and bake 15-20 minutes or until toothpick inserted in the center of one cupcake comes out clean.
