Miso Clam Chowder

Name: Miso Clam Chowder
Ingredients: 907g (2lbs) littleneck or manilla clams; 4 cups cold water; ¼ cup salt; 3 tbsp unsalted butter; 1 yellow onion (diced); 3 carrots (peeled and chopped); 3 stalks celery (chopped); ½ cup dry vermouth **; 350g (12oz) baby red potatoes (quartered); 3 cups seafood stock ***; 1 (236 ml, 8 fl oz) bottle clam juice; 2 bay leaves; 2 tbsp white miso; 2 (354ml, 12 fl oz) cans evaporated milk; sesame oil (for drizzling ); furikake (for sprinkling ); celery leaves (finely chopped, for sprinkling )