Sift your cake flour, cocoa, and salt into a bowl. This removes lumps and makes the dry ingredients very light. Set this mixture aside for the next step today.

Cream the butter and sugar in your stand mixer. Beat them until the mixture is very pale and fluffy. Add your eggs one at a time while mixing.

Mix the red food coloring into the buttermilk slowly. Add this to the butter mixture with the dry ingredients. Alternate between the two for a very smooth batter.

Stir the vinegar and baking soda in a small cup. Fold this bubbling mixture into the cake batter quickly. It adds the final lift for a professional sponge.

Pour the batter into the pans and bake them. Let the layers cool fully before you add frosting. Serve with a thick layer of cream cheese icing.