1Sauté onion, fennel, leek and garlic, add flour, wine, milk, cream, salt and pepper to make the sauce, stir in dill and add fish. Pipe on mashed potato. Spray olive oil. Bake for 35 minutes until golden. Rest 5 minutes, then serve.
2First place potatoes in a large saucepan, cover with cold water. Bring to a boil, then simmer 25 minutes until very soft. You can start making the sauce while the potatoes are cooking.