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5
servingsEasy
Published 2014
Lay the herring fillets skin side down and spread them with 65 g (2½ oz) of the butter and the mustard, if using. Season with black pepper and a little salt and roll them up, skin side out.
Butter a fairly deep ovenproof dish (earthenware would be ideal) and put in half the potato slices, then one of the sliced apples and one of the onions. Lay the herring rolls on top, and cover them w
