1 onion, chopped
a few parsley stalks
salt and pepper
1 bay leaf
2 cloves
15²µ/½´Ç³ú plain flour
15²µ/½´Ç³ú butter, plus extra knob for cooking
1 tbsp crème fraîche
5 large free-range eggs, plus 2 yolks
700ml/1¼ pint milk
50²µ/1¾´Ç³ú Parmesan, finely grated
1 undyed smoked haddock fillet (about 300g/10½oz)