A rich, deeply spiced curry slow-cooked until the aromatic tomato and onion reduction clings intimately to the tender cuts.
Put the onions, tomato purée (paste), lemon juice, chilli powder, coriander powder, salt, turmeric, whole green chillies, the fresh coriander and water and into a food processor. Blend for about 1 minute
Heat the oil in a deep round-bottomed frying pan (Balti bowl) or a karahi. Lower the heat slightly and add the spice mixture. Fry the mixture for 3-5 minutes or until the sauce has thickened slightly
Add the prawns and stir-fry over a medium high heat
As soon as the prawns are heated through, transfer them to a serving dish and garnish with the rest of the fresh coriander and the chopped green chilli, if using. Serve immediately