Start chopping 3 onions. On the recipe I used only one, and I was short. Chop 3 or 4 garlic cloves. Chop a bunch of parsley.
Add olive oil in a casserole, and when the oil is hot add chopped onions and garlic. Also add salt and pepper if you like. Cook with the fire set low, moving frequently.
When the onion is cooked, add salt to the monkfish and cover with flour. Add the monkfish and the prawns to the casserole. Cook them at low fire, turning monkfish and prawns several time. Once cooked add chopped parsley and serve.