Operators with the resources to develop their own plant-based burgers are often pulling out all the stops with sophisticated flavors and satisfying blends of vegetables, beans and legumes, grains, nuts, and other plant proteins. For example, the cult-favorite namesake at vegetarian Superiority Burger in New York City is made with roasted carrots, chickpeas, quinoa, breadcrumbs, potato starch, and crushed walnuts, plus fennel, sriracha, parsley, lemon, and other seasonings.