Cook the pasta in salted boiling water as per the packet instructions.
Heat some cooking oil in a large frying pan over a medium to high heat. Cook the onion for about 4-5 minutes, or until it softens
Add in the chilli and the garlic and cook for a further minute.
Pour in the white wine, then bring it to the boil and reduce it by half, until it starts to turn syrupy.
Now add in the prawns and mixed fish, along with the double cream, and stir it well. Bring it to a simmer and cook, stirring occasionally, until the fish has cooked, and the sauce has thickened. This should only take a few minutes.
Once the pasta is cooked, drain it, but keep some of the pasta water. Add the pasta into the sauce along with the zest and the juice of the lemon, and the chopped parsley.
Taste for seasoning and add some salt and pepper if needed. If it needs loosening up, then add a little pasta water. Dish it up and finish it with a bit more lemon zest.