Rinse and sort beans; soak according to package directions., Drain and rinse beans, discarding liquid. Place in a Dutch oven. Add the tomatoes with juice, onion, ham hock, broth, water, salt and pepper. Bring to a boil. Reduce heat; cover and simmer until beans are tender, about 1-1/2 hours., Add more water if necessary. Remove ham hock and let it stand until cool enough to handle. Remove meat from bone; discard bone. Cut meat into bite-sized pieces; set aside. (For a thicker soup, cool slightly, then puree beans in a food processor or blender and return to pan.) Return ham to soup and heat through. Garnish with parsley if desired.