Gently heat the oil in a wok, large frying pan or saucepan. Add the cumin seeds and fry gently until they pop.

Add the onion and gently fry until the onion goes mushy and slightly brown. Add garlic and saute until the raw smell disappears. Then add the chillies and saute until the raw smell disappears.

Next, add the tomatoes and allow to soften. Then add turmeric powder, coriander powder and chilli powder. Allow to simmer gently until the oil separates.

Add the boiling water and allow to cook for 10-15 mins, until most of the water has evaporated away and the mixture starts to go thick again.

Then, add the prawns and salt. Allow to heat through for about 3-4 mins. If the mixture is looking a bit thick, add some more boiling water. Allow to thicken a little bit if you accidentally put too much water in!

Finally, add garam masala and stir for a minute. Gradually stir in the pot of yoghurt, allow to heat through for a few minutes on a low flame. Top with coriander leaves to garnish.

Serve with basmati rice or nan bread.