INGREDIENTS
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4 celery stalks, with leaves if possible
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1 onion, quartered
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1 carrot, quartered
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10–12 black peppercorns
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1 bouquet garni, made with 5–6 sprigs of parsley, 2–3 sprigs of thyme, and 1 bay leaf
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salt and freshly ground black pepper
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4 skinless, boneless chicken breasts, total weight about 1lb 10oz (750g)
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4 1/2oz (125g) walnuts
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1lb 2oz (500g) tart, crisp apples
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juice of 1 lemon
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2/3 cup natural yogurt
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2/3 cup mayonnaise