n n Heat oil in a dutch oven over medium-high heat.n n Add chopped onion, carrot, celery and garlic. Cook 5 minutes and remove from pan.n n Add sausage and cook for about 8 minutes or so, crumbling as you go.n n Add onion mixture back to pan, then add all remaining ingredients except parmesan cheese.n n Bring to a boil and stir, then reduce heat to simmer and cook for about 10-15 minutes.n n Remove bay leaf.n n Serve hot with parmesan cheese and crusty bread for dipping.nn