Patty Melts with Grilled Onions

Patty Melts with Grilled Onions was pinched from <a href="http://www.myrecipes.com/recipe/patty-melts-with-grilled-onions-10000001734336/" target="_blank">www.myrecipes.com.</a>
INGREDIENTS
8 (1/8-inch-thick) slices Vidalia or other sweet onion
1 tablespoon balsamic vinegar
Cooking spray
1 pound extralean ground beef
1/4 teaspoon salt
1/4 teaspoon freshly ground black pepper
3 tablespoons creamy mustard blend (such as Dijonnaise)
8 (1-ounce) slices rye bread
1 cup (4 ounces) shredded reduced-fat Jarlsberg cheese
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