Preheat the oven to 350 degrees
Whisk together buttermilk, eggs, vegetable oil, vinegar and vanilla in a tall liquid measuring cup, set aside.
In a small bowl, add the cocoa powder and red food coloring together, set aside.
In another bowl combine the flour, salt and baking soda, set aside. (Lots of setting aside : P)
With an electric mixer and a paddle attachment, beat the butter and sugar on medium high.
Reduce speed and then add the buttermilk mixture and flour in 3 additions, alternating.
Add cocoa mixture and beat on low until everything is incorporated.
Divide the batter into 2, greased 9-inch round pans.
Bake for about 20 to 25 minutes, try to take it out when the center is just a little wiggly.