INGREDIENTS
1 lb
Carrots
3
Celery stalks
1
Flat-leaf parsley, fresh
1 1/2 lb
Jerusalem artichokes
1
Onion, medium
1
Salt and freshly milled black pepper
3 oz
Butter
6
level tsp Creme fraiche
1.5 litres (2½ pints) hot vegetable stock made with Marigold Swiss vegetable bouillon powder