Heat the vegetable oil in a frying pan and cook the onions over medium heat for five minutes.
Add the garlic and cook for another minute.
Mix in the curry paste and cook for one more minute.
Add the tomato and stock, cover and simmer for 15 minutes.
Add the monkfish and cook for another 10 minutes or until the fish flakes easily.
Serving Suggestions: Serve with steamed rice or naan bread.