porridge is a traditional food in many countries in northern europe. it is usually eaten for breakfast. in some countries barley or other grains may be used. porridge is cooked in saucepans or in a microwave. traditionally, it was cooked in large metal kettles over hot coals. porridge was often served as food for prisoners in prisons. this is why in english there is a slang expression "doing porridge" which means "being in prison". porridge is also given to people who are ill because it is healthy and easy to eat and digest.