squeeze lemon juice
陆 onion, thickly sliced
200g/7oz baby spinach leaves
1 tbsp English mustard
1 tbsp plain flour
1 bay leaf
salt and pepper
2 tbsp white wine vinegar
40驳/1陆辞锄 butter
2 large free-range eggs
500ml/18fl oz milk
2 x 175g/6oz natural smoked haddock, pin boned and skin on