It can be! We like the savory flavor of chicken broth, but if you want a vegetarian soup, chicken-flavored broth (a vegetarian broth despite its name) is preferable to vegetable broth for its hearty, rich flavor and light golden color. Vegetable broth will work too, but it may darken the color. Sometimes called “no-chicken” broth, it can be found with the soups in the natural foods section of most supermarkets.