Stuffed chicken thighs

olive oil

small onion, peeled, finely chopped

garlic cloves, crushed to a paste with the edge of a knife

g/3oz fresh white breadcrumbs

chopped fresh parsley

fresh thyme leaves

lemon, zest only, plus the juice of half a lemon

free-range egg yolk

salt and freshly ground black pepper

chicken thighs, bones removed, skin left on

butter