2 sticks celery, roughly chopped
1 leek, cleaned, halved lengthways and finely chopped
small handful flat-leaf parsley or chives, roughly chopped, to serve
1 small onion or banana shallot, finely chopped
225g/8oz waxy potatoes, peeled and diced into 1.5cm/鈪漣n cubes
30g/1oz plain flour
1 bay leaf
10 turns black peppermill
pinch freshly grated nutmeg
1 tsp salt
40g/1陆oz unsalted butter
200ml/7fl oz double cream
500ml/18fl oz whole milk
75g/2戮oz smoked streaky bacon, finely chopped
1kg/2lb 4oz fresh clams, scrubbed
200g/7oz cod fillet (or other white fish), skin removed, cut into 2cm/戮in pieces
6 sourdough rolls or crusty rolls (roughly12cm/4陆in diameter), tops removed, dough scooped out and discarded