Marble cake with chocolate icing - iCookGreek

Ingredients

• 500g self-raising flour
• 2 1/2 cups sugar
• 250g margarine or butter, plus a little more for greasing the cake mould
• 4 eggs
• 1 1/4 cup milk
• peel from 1 orange, or vanilla extract
• 2 tbsp cocoa
• For the chocolate icing:
• 125g confectioner's chocolate
• 4 tbsp icing sugar
• 2 tbsp milk
• 1 tbsp cognac
• 100g butter, cut into small pieces