1 lemon, zest only
4 onions, peeled, quartered
8 fresh sage leaves
salt and freshly ground black pepper
125g/4陆oz fresh breadcrumbs
4 tbsp caster sugar
pinch freshly grated nutmeg
40驳/1陆辞锄 butter, plus extra for brushing
25g/1oz unsalted butter
1 free-range egg yolk
2 x 1kg/2lb 2oz free-range chickens
300ml/10陆fl oz white wine