Portobello Steak Burger with Caramelized Onions

Onion-burger-ck-665198-l
(3) Course Sandwiches and Wraps

Ingredients in this Recipe

  • 1 1/2 cups sliced onion
  • 1 cup balsamic vinegar
  • 1 teaspoon bottled minced roasted garlic
  • 1 teaspoon dried basil
  • 1/4 cup low-fat mayonnaise
  • 1/4 teaspoon ground white pepper
  • 1/4 teaspoon kosher salt
  • 2 garlic cloves, minced
  • 2 tablespoons olive oil
  • 6 (2-ounce) whole-wheat Kaiser rolls or hamburger buns
  • 6 curly leaf lettuce leaves
  • 6 large (1/4-inch-thick) slices tomato
  • 6 portobello mushroom caps (about 1 1/2 pounds)
  • Cooking spray

Recipe Preparation

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