Rasam is the fiercely hot vegetarian soup of Southern India and Sri Lanka. The leftover dal not used in the soup can be stir-fried with onions and garlic.
First cook the dal: put in a pan with 1.1litres/ 2pints of water, the turmeric and ginger. Bring to the boil, cover, lower the heat and simmer for 45 minutes. Check regularly to ensure the pan doesn’t dr