Chop finely and fry until well browned one medium sized onion. When the onion is well browned, add a teacup of red lentils, a flat teaspoon of turmeric and a flat teaspoon of salt. Fry for about 30 seconds, then add three teacups of hot water. Mix well and bring to the boil, then simmer until the mixture is like porridge. Serve as an accompaniment to a curry or eat warm in a sandwich.