1. Preheat the Oven
   Preheat your oven to 350°F (175°C). Grease and flour two 9-inch round cake pans, ensuring an easy release after baking.
2. Prepare Dry Ingredients
   In a medium bowl, sift together the flour, cocoa powder, baking soda, and salt. Set aside.
3. Cream Butter and Sugar
   In a large mixing bowl, beat the softened butter and granulated sugar together using a hand or stand mixer on medium speed until light and fluffy, about 3-5 minutes.
4. Add Eggs
   Add the eggs one at a time, beating well after each addition. Scrape down the sides of the bowl as needed.
5. Alternate Dry Ingredients and Buttermilk
   Gradually add the sifted dry ingredients to the butter mixture in three parts, alternating with the buttermilk. Start with a little of the dry mix, then a bit of buttermilk, and continue until all ingredients are incorporated. Mix until just combined to avoid overmixing.
6. Add Vinegar, Oil, and Food Coloring
   In a small bowl, combine the vinegar, vegetable oil, and black food coloring. Add to the batter and mix well.
7. Bake the Cake
   Divide the batter evenly between the prepared cake pans. Smooth the tops with a spatula. Bake for 30-35 minutes or until a toothpick inserted in the center comes out clean.
8. Cool the Cake
   Let the cakes cool in the pans for 10 minutes before transferring them to a wire rack to cool completely.

For the Cream Cheese Frosting:

1. Make the Frosting
   In a mixing bowl, beat the softened cream cheese and butter together until smooth and creamy. Gradually add the powdered sugar, 1 cup at a time, beating on low speed until smooth. Stir in vanilla extract and a pinch of salt.
2. Frost the Cake
   Once the cake layers are completely cool, spread a layer of cream cheese frosting on top of one cake layer. Place the second layer on top and frost the entire cake with the remaining frosting.
3. Chill and Serve
   For best results, refrigerate the cake for 30 minutes to set the frosting. Slice, serve, and enjoy