Preheat the oven to 350°F or 180°C.
Butter two 9-inch cake pans and then dust them with flour. In a medium-sized mixing bowl, combine all-purpose flour, cocoa powder, baking soda, and salt. Set aside.
Add softened butter and sugar in a large mixing bowl, and mix with a hand or stand mixer until sugar is moist and well incorporated. Then add the vanilla extract and mix some more.
Add one egg at a time and mix well before adding the next egg. Beat until there is no egg visible.
Slowly add the vegetable oil; keep mixing while adding it to the batter.
Combine the white distilled vinegar with the buttermilk and add it to the batter.
With a sifter, sift the dry ingredients into the batter and mix it until no more flour mixture is visible. Add half a teaspoon of Red food coloring to the batter and mix until you have evenly red cake batter. Divide the batter into two cake pans. I use a kitchen scale and add about 650g of batter to each cake pan. If you use a scale, you will have two even cake layers.
Put them in the oven and bake for 30-35 minutes.
Take them out of the oven and let cool for about 20 minutes until you flip them over and take the cakes out of the pan and onto a cooling rack.