In this video, you’ll see how to make Portobello mushroom burgers. Grilled Portobello mushroom caps, prepared in a garlic and balsamic vinegar marinade, give these veggie burgers their meaty flavor and excellent texture. It’s the steak of veggie burgers! The kind of hearty burger that meat eaters and vegetarians alike will love. And in the off season, you can always broil the mushrooms. Watch the video, then get Bob's 5-star recipe for Portobello Mushroom Burgers. Top it with a slice of provolone cheese, and serve it on a toasted bun with lettuce, tomato, and an aioli sauce.