2 garlic cloves, crushed to a paste with the edge of a knife
1 lemon, zest only, plus the juice of half a lemon
1 small onion, peeled, finely chopped
1 tbsp chopped fresh parsley
2 tsp fresh thyme leaves
salt and freshly ground black pepper
75g/3oz fresh white breadcrumbs
2 tbsp olive oil
1-2 tbsp butter
1 free-range egg yolk
6 chicken thighs, bones removed, skin left on