Add tin of tomato and fry for a few minutes, stirring often. Now add the lamb, salt to taste, and stir well. Fry till browned. Now add all the dals/lentils to the pot. Stir well and add three cups of water. If you are using a pressure cooker, this is the time to put on the lid and cook until you have heard three whistles. The dal/lentils should be done by now. Turn off the heat and allow the steam to release and open the pressure cooker.