Preheat oven to 350 degrees.
Grease/flour 2 9 inch cake pans.
In mixer, whisk flour, sugar, cocoa powder, baking soda and salt.
Add eggs, oil, buttermilk, food coloring, vanilla and vinegar.
Beat until smooth and pour into 2 pans.
Bake about 30 mins.
Let cool in pan and then invert onto cooling rack. Once cool, can wrap in saran and freeze.