1 small onion
salt and freshly ground black pepper
75-100g (2½ to 3½ oz) fresh white breadcrumbs
cayenne pepper, for sprinkling
4 cloves
freshly grated nutmeg, to taste
175g/6oz unsalted or lightly salted butter
40g/1½oz butter or 2 tbsp double cream
450ml/15fl oz full-cream milk
1 free-range turkey weighing 4kg/8lb 11oz