1 onion, chopped
a few parsley stalks
salt and pepper
1 bay leaf
2 cloves
15驳/陆辞锄 plain flour
15驳/陆辞锄 butter, plus extra knob for cooking
1 tbsp cr猫me fra卯che
5 large free-range eggs, plus 2 yolks
700ml/1录 pint milk
50驳/1戮辞锄 Parmesan, finely grated
1 undyed smoked haddock fillet (about 300g/10陆oz)