In a large stock pot over medium high heat, brown sausages evenly. Cook for 10 minutes then remove from pan and set aside.
In the same pan, add oil, onions, bell pepper, and garlic. Let cook for 3 minutes. Then add tomatoes, broth, seasonings and vinegar. Reduce heat to medium and cover pot with lid and cook for 25 minutes.
Cut sausages into ½-inch coins. Add to pot along with beans (in juices). Stir to combine, replace lid and cook another 10 minutes.
Serve in a shallow bowl with generous sprinkle of parmesan cheese on top.
Keyword Italian Sausage, soup, tomato, white beans