Portobello Steak Burger With Caramelized Onions

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1 cup balsamic vinegar

2 tablespoons olive oil

1 teaspoon dried basil

1/4 teaspoon kosher salt

1/4 teaspoon ground white pepper

2 garlic cloves, minced

6 portobello mushroom caps (about 1 1/2 pounds)

Cooking spray

1 tablespoon olive oil

1 1/2 cups sliced onion

1/4 cup low-fat mayonnaise

1 teaspoon bottled minced roasted garlic

6 (2-ounce) whole-wheat Kaiser rolls or hamburger buns

6 curly leaf lettuce leaves

6 large (1/4-inch-thick) slices tomato

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