Instructions: 1 The day before: soak the fish in plenty of cold water for 12 hours to remove the salt, changing the water several times.

2 The next day: preheat the oven (gas mark 6 / 400F / 200C). Drain the cod fillets. Put them in a large saucepan of cold water and heat, but as soon as the water begins to boil, remove and strain. When the fish is still warm, flake it to remove the bones.

3 Peel and wash the potatoes, slice thinly. Peel and finely chop the onions.

4 Grease an ovenproof dish. Put in alternating layers of onion, fish and potatoes. Do not use salt, but plenty of pepper. Put a few knobs of butter on top, then pour on the milk. Sprinkle with the grated cheese over. Bake for 1 hour.

When cooking cod, never let the water boil as this toughens the fish.

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