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Put the fish, peppercorns and bay leaf into a large, shallow pan, then cover with the milk and stock. Bring to a very gentle simmer, then poach the fish for 5-8 mins, skin-side down, until it just starts to flake at the thickest part. Lift out the fish and set aside.
Meanwhile, heat the butter in a large saucepan, then soften the leeks for 10 mins without colouring. Once soft, turn up the heat a little and add the cumin seeds, frying until they sizzle and start to smell toasty. Tip in the potatoes, then add the poaching liquid and simmer for 20 mins until the potatoes are tender and starting to fall apart. Just before serving, flake the fish and stir through. Spoon into shallow bowls and serve.
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