I found this recipe from Anna Jones in ” Around the World in 80 dishes” by David Loftus.
Put the prawns into a bowl and season with a pinch of salt. Sprinkle over half the turmeric and stir, then set aside for 15 minutes to marinate.
Put a couple of tablespoons of oil into a large deep frying pan over a high heat. Add the prawns and fry for 2 minutes or so on each side until golden brown, then remove to a plate and set aside.
Add a little more oil to the pan and put back on the heat. Put in the potato cubes and fry until golden, then add the nigella seeds and the chillies.
Add the spring onions and cook until lightly browned and softened, then stir in the remaining turmeric, the chilli powder and a little salt.
Pour in a mugful of water, cover with a lid and simmer until the potatoes are cooked through, stirring from time to time and adding more water if it looks too dry.
Return the prawns to the pan and cook for a further minute or so to warm them through. Serve with warm chapattis and simple basmati rice.