Recipe?
Just kind of threw it together based on recipes I've seen Rick Stein doing......
Fry off a large onion (use a red onion as it's sweeter) until soft then add chopped garlic and tomatoes. continue to heat this until the tomatoes break down and form a "sauce". I then added garam masala, cumin, salt, pepper and some crushed ginger and stirred in whilst it continued to bubble away. A couple of dessert spoonfuls of tandoori paste was added and stirred in before removing from the heat to add a couple of dessert spoonfuls of natural yoghurt and stir through. Put this back on the heat to then add the chunks of fish to gently cook in the curry with a lid on the pan.
I used a mixture of skinned and de-boned swordfish and red snapper fillets as it's readily available from the supermarkets here for making sushi but any flaky white fish that will hold its shape whilst cooking will do.
Loosely based on this recipe but unable to get hold of all these ingredients out here : https://indianhealthyrecipes.com/fish-curry-recipe/