Marinated Portobello Burgers with Caramelized Onions and Roasted Garlic Aioli

Marinated Portobello Burgers with Caramelized Onions and Roasted Garlic Aioli was pinched from <a href="http://oneperfectbite.blogspot.com/2010/05/marinated-portobello-burgers-with.html" target="_blank">oneperfectbite.blogspot.com.</a>
INGREDIENTS
Marinade
1 cup balsamic vinegar
2 tablespoons olive oil
1 teaspoon dried basil
1/4 teaspoon kosher salt
1/4 teaspoon freshly ground black pepper
2 garlic cloves, minced
.
6 portobello mushroom caps
.
Caramelized Onions
1 tablespoon olive oil
1-1/2 cups sliced onion
Aioli
1/2 cup low-fat mayonnaise
2 teaspoon bottled minced roasted garlic
Burgers
Cooking Spray
6 Brioche rolls or quality hamburger buns
6 curly leaf lettuce leaves
6 large (1/3-inch thick) slices tomato
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