1.) In 10-inch non-stick skillet over medium heat, in 1 Tbsp. hot olive oil, cook onions 7 to 8 minutes or until browned and almost tender, stirring occasionally. Add vinegar and 1/8 tsp. salt. Reduce heat to low; cover and cook 3 to 5 minutes or until tender; set aside.

2.) In 10-inch skillet over medium-high heat, in remaining 1 Tbsp. hot olive oil, cook mushrooms 2 minutes, stirring frequently. Add garlic, thyme and lemon zest and cook 2 minutes or until mushrooms are tender; cool.

3.) In bowl, mix ground veal, mushroom mixture and remaining 1/4 tsp. salt. Shape into four 3/4-inch-thick patties.

4.) Prepare a charcoal or gas grill or use a grill pan on top of stove over medium heat. Place rolls, cut-side down on grill; lightly toast. Remove rolls. Grill burgers 10 to 14 minutes, turning once or until internal temperature of 160° F. Place roll bottoms on serving platter. Top each bottom with lettuce leaf. Place burger on top of lettuce. Top each burger with sliced cheese, some balsamic onions and roll tops.

*You can use 8 oz. of any combination or type of mushroom variety.

4.17 avg. rating (83% score) - 6 votes

Nutrition information per serving: 550 k/Cal; 32 g protein; 54 g carbohydrate; 25 g fat; 8 g saturated fat; 70 mg cholesterol; 510 mg sodium; 0 g trans fat; 4 g fiber; 14 g total sugars; 15% DV calcium; 10% DV iron; 10% DV potassium.

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