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Lambs’ sweetbreads are readily available but not often found in supermarkets, so you will need to ask your butcher. He may offer you frozen ones but you should check the quality (they must be round rather than scraggly). Ask him for the little plump heart sweetbreads, as these are more tender.
First, mix together all the ingredients for the Tartare Sauce and season.
Put the onion, carrot, leek, bay leaf, thyme, salt, peppercorns and water in a pan, bring to the boil and simmer for 10 minutes. Add the sweetbreads, bring back to the boil and remove the pan from the heat. Let the sweetbreads cool in the cooking liquor. Drain them and remove any excess fat from them with your fin
