Once cool, grind the spices in a spice grinder or pestle and mortar until you have a fine powder. For the curry, heat the oil in a large pan and add the curry leaves, onion, garlic and ginger.
Stir in the curry powder, chilli and tomato purée and cook ... Stir-fry your choice of other ingredients (such as strips of chicken or meat, prawns, vegetables) in a large frying pan or wok ...