• 1 ripe avocado, sliced
  • 1 tablespoon lemon juice
  • 1 tablespoon butter
  • 1 large Vidalia onions, sliced into rings
  • 4 boneless, skinless chicken breast halves
  • salt and pepper to taste
  • 4 hamburger buns
  • 4 tablespoons mayonnaise
  • 4 slices provolone cheese
  • In a small bowl, combine sliced avocado and lemon juice. Add water to cover; set aside. Preheat an outdoor grill for high heat and lightly oil grate.
  • Heat butter in a large heavy skillet over medium-high heat. Saute the onions until browned and caramelized; set aside.
  • Season the chicken with salt and pepper. Place on grill, and cook until no longer pink and juices run clear, about 5 minutes on each side. Place buns on grill just long enough to toast them.
  • Spread buns with mayonnaise to taste, then layer with chicken, caramelized onion, provolone and avocado.