In medium bowl combine ground round, garlic, mushrooms, Worcestershire sauce and pepper. Shape meat mixture into 4 patties. Cover and chill 1 hour.
Coat grill rack with nonstick cooking spray. Preheat grill to medium-high. Grill burgers, covered, 4 to 6 minutes or until a meat thermometer registers 160°F. Serve on buns with tomato and spinach.
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