Grease a 1.5 litre pudding basin. Mix all the ingredients together except for the egg and the milk. Add the beaten egg and milk and mix well. Put the mixture into the basin, cover with aluminium foil or a cloth. Place in a large saucepan with water halfway up the sides of the basin. Bring the water to the boil, put on a tight fitting lid and simmer for 3 hours. Check occasionally remembering to carefully top up with boiling water to stop it going dry.