Portobello mushrooms are a great alternative to beef or turkey burgers for their juicy, meaty texture and nutrients. ???Portobellos have a good amount of protein as well as folate and other B vitamins, selenium, potassium and more,??? Rudat says. ???When marinated and grilled, top with a roasted red pepper and a chunk of fresh mozzarella, and serve on a fresh whole-grain roll.???