Makes 12 cakes

Preheat oven to 180°c/350°f/gas 4

Line a 12 hole cupcake pan with paper cases

Using an electric mixer, beat the butter and sugar until pale. Slowly add the egg until well incorporated

In a seperste bowl beat the vanilla, colouring, salt and cocoa into a thick paste and beat into the butter mixture

With the mixer on a slow speed, add the flour and buttermilk alternating each and begining and ending with the flour

Stir the vinegar into the baking soda and fold into the mixture

Leave to stand for 3 minutes

Spoon the pan into the paper cases to 3/4 full

Bake for 15 minutes or until a knife comes out clean

Cool on a wire rack

To make the frosting: beat the butter and cream cheese together until there are no lumps

Add the vanilla and gradually add the sugar

Either use a piping bag or a spoon to decorate your cakes once cool