Postman Italian Fish Soup

1/2 c Olive oil
3 Leeks; white only, cleaned and sliced
2 Cloves garlic; finely diced
1 Yellow onion; peeled and chopped
1 c Celery; chopped
1 c Fresh mushrooms; sliced
6 c Fish stock; clam juice or water
1 c Tomato sauce
1 c Dry white wine
Cayenne
Salt
2 lb Total of clams; shrimp in shell; or mussels (soak clams or mussels in cold water for 1 hour and drain)
1 lb Fillet of white fish; sea bass; or cod, cut into small pieces
Chopped parsley


Heat the olive oil in a large, heavy pot over medium heat. Saute leeks, garlic, onion, celery and mushrooms until onions are soft, about 5 minutes. Add stock, tomato sauce, and wine. Bring to simmer, and season with cayenne and salt totaste. Add clams and mussels to pot if using. When they are almost cooked, add fish and remaining seafood, and simmer until all is tender. Garnish with parsley.