1 lemon, zest only
4 onions, peeled, quartered
8 fresh sage leaves
salt and freshly ground black pepper
125g/4Β½oz fresh breadcrumbs
4 tbsp caster sugar
pinch freshly grated nutmeg
40²µ/1Β½΄Η³ϊ butter, plus extra for brushing
25g/1oz unsalted butter
1 free-range egg yolk
2 x 1kg/2lb 2oz free-range chickens
300ml/10Β½fl oz white wine