1 celery stick, peeled and chopped
10g/¼oz fresh parsley leaves, chopped
2 small shallots, finely chopped
200g/7oz spinach
2 sprigs fresh tarragon, leaves only
2-3 drops Tabasco
30g/1oz butter
1kg/2lb 4oz mussels, cleaned and de-bearded
200ml/7fl oz dry sherry