¼ lemon, juice only
small handful fresh flatleaf parsley, chopped
2 shallots, finely chopped
1 fresh thyme sprig
225ml/8fl oz chicken stock (see tip)
salt and freshly ground black pepper
40²µ/1½´Ç³ú butter
225g/8oz full-fat crème fraîche
1 free-range egg yolk
75g/2¾oz unsmoked bacon lardons
2kg/4lb 8oz mussels, scrubbed and debearded
200ml/7fl oz dry cider