Line your cupcake pan with liners . Preheat the oven to 180 degrees C.
Measure out the dry ingredients , that is , the flour, salt , cocoa and baking soda
Whisk them together
In another bowl , whisk together the egg, sugar, oil , buttermilk , and vanilla
Add the vinegar and red food coloring
Mix well until the color is uniform
Add the dry ingredients to the wet and mix until smooth
It is a thickish batter. If you are unhappy with the colour, you can add more food colouring now.
Fill liners 2/3rd full.
Bake at 180 C/350 F for 15-18 minutes or until toothpick inserted comes out clean. Cool completely before icing.