Preheat the oven to 180 degrees.grease and dust baking tin

Beat the margarine and sugar till light n fluffy with a mixer

Add vanilla and eggs one by one to the mixture

Sift the flour,cocoa and baking powder.add color to the buttermilk

Add the flour in 3 batches alternating with the buttermilk

Then in a separate bowl mix the vinegar and baking soda till it fizzes

Then quickly add it to the batter and fold it in

Quickly put it in a pan and bake it