200g/7oz celeriac, peeled and cut into cubes, cooked until tender, drained
1 lemon, juice only, plus extra lemon wedges, to serve
200g/7oz new potatoes, cooked until tender, drained
陆 onion, peeled, finely sliced
3 tbsp chopped fresh parsley leaves
1 fresh bay leaf
salt and freshly ground black pepper
25g/1oz flour
50驳/1戮辞锄 flour
pinch freshly grated nutmeg
4 whole white peppercorns
1-2 tbsp vegetable oil
35驳/1陆辞锄 butter
75g/3oz butter
1 tbsp double cream
300ml/10陆fl oz full-fat milk
4 x 175g/6oz cod fillets