Preheat oven to 350 degrees. Butter three 9 inch cake rounds. Dust with flour and tap out the excess.

Mix together flour, sugar, cornstarch, cocoa, baking powder, baking soda & salt in a stand mixer using a low speed until combined

Add eggs, buttermilk, warm water, oil, vanilla, vinegar and red food coloring. Beat on a medium speed until smooth. This should take only a couple of minutes

Divide batter into the three prepared pans

Bake for 30-35minutes until the cake meets the toothpick test. (stick a toothpick in and it comes out clean)

Cool on wire racks for 15 minutes & then turn out the cakes and allow to cool completely before frosting