Make the 8″ square Dark Chocolate Mud Cake 500g unsalted butter 400g dark chocolate 10g (2 tablespoon) instant coffee 2-2/3 cups warm water 380g (2 cup) caster sugar 520g (3 cups) self raising flour 60g (1/2 cup) cocoa 4 eggs 2 teaspoon vanilla 1. Grease and line base and sides of cake pan with one…