Add oil to a casserole. Fry the pepper and all the shellfish until well browned. Add the fish bones and the garlic. Add all the vegetables and mineral water.
Fry the onion, garlic and tomato on a low heat until they are well caramelized.
Add 1 tbsp of the chopped ingredients, fry on a low heat and add the brandy until all the alcohol has evaporated.
Add the fish stock. When it begins to boil add the quartered potatoes and cook for 8 minutes.
Add the fish and cook for 5 more minutes. Finally, add the shellfish, giving them just long enough to heat through.
Test for seasoning. Allow to rest for 3 minutes before serving.