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Grilled Portabella Burger

Looking for a vegetarian burger for your next BBQ? This grilled portabella burger is packed with so much flavor that you won;t even miss the meat.
Prep Time10 mins
Cook Time20 mins
Total Time30 mins
Course: Main Course
Cuisine: Burgers, Sandwiches, Pizza, Vegetarian
Keyword: burgers, meatless, vegetarian
Servings: 4


  • 4 portabella mushrooms stems removed
  • 4 hamburger buns
  • 20 cherry tomatoes halved
  • 4 thick slices vine tomato
  • 1 cup vidalia onion diced
  • 6 tsp. olive oil
  • 8 slices provolone cheese
  • 8 tsp. balsamic glaze
  • 8 tsp basil pesto
  • 4 tsp mayonnaise
  • 1 cup herb salad mix


  • Start your grill.
  • In a saute pan over medium heat, cook onions in 1 tsp olive oil until softened, add cherry tomatoes and cook until softened. Set aside.
  • Drizzle 1 tsp balsamic glaze inside each mushroom cap
  • Place 1 slice provolone cheese inside each mushroom cap
  • Place ¼ of tomato mixture inside each mushroom cap
  • Top filling in each mushroom cap with 1 tsp basil pesto
  • Brush all sides of each mushroom with 1 tsp olive oil
  • Grill until browned and softened, top each mushroom with 1 slice provolone and grill until melted
  • While mushrooms are grilling, make tomato topping by sauteing thick tomato slices in 1 tsp olive oil over medium heat until browned
  • Spread each bun with 1 tsp mayo and 1 tsp basil pesto (dividing amount between top/bottom bun)
  • Place portabella on bun, top with ¼ cup herb salad and 1 cooked thick tomato, drizzle with 1 tsp balsamic glaze and top with bun