If you are looking for a last-minute Christmas gift to make, then this is a doddle. It isn't realy fudge, but ends up as a fudgy treat. You need to melt 8oz of unsalted butter and a cup (American measure, sorry) of smooth peanut butter in a pot or microwave. Let the mix cook for a minute or two. Stir in a teaspoon of vanilla essence and a pound of icing sugar. It will go crumbly and stiff and difficult to beat. This is normal! Line a 20cm square tin with baking parchment and press the warm mixture evenly into the base. Cover it with another sheet of parchment and this makes it easier to press down and 'squidge' - technical term there. Allow to set and chill in the fridge for a good couple of hours or overnight. Cut into small pieces - it is rich and sweet. You can drizzle with melted chocolate too if liked. Best eaten with a syringe of insulin by your side and a defibrillator.