1 leek, finely diced
3 lemons
1 onion, halved and studded with 2 cloves
4 tbsp flat leaf parsley, finely chopped
Salt and pepper
25g/1oz plain flour
1 bay leaf
Β½ tsp black peppercorns
50²µ/1ΒΎ΄Η³ϊ butter
50ml/2 fl oz double cream
500ml/18 fl oz full fat milk
4 x 175g/6oz salmon fillet, skin on