Melt the butter in a large uncovered pot. Add the onions, shallots, parsley, and thyme. Cover and cook over low heat, stirring frequently, for 15 minutes or until onions are tender. Add the carrots, celery, potato, wine, tomatoes, and zucchini. Bring to a boil over medium heat, uncovered. Lower the heat, stir in the rice, and simmer, stirring frequently about 1 hour unti