For the caramelized onions:
3 sweet onions, sliced into half-moons
2 tablespoons olive oil
1 tablespoon butter
Salt, to taste
For the burger patties:
1 pound ground turkey
1 large egg, beaten
2 cloves garlic, minced
1 tablespoon Worcestershire sauce
For the burger assembly:
4 buns of your choice, split
4 ounces Mozzarella cheese, shredded
Store-bought cranberry sauce
Mayonnaise
Large handful of lettuce or leafy greens
Make the caramelized onions: Heat butter and oil in a large skillet to medium. Add onions and sauté, stirring every 5 minutes, for 30 minutes or until the onions become a rich, caramel color. Season with salt and set aside.
Make the burger patties: combine all burger patty ingredients in a mixing bowl and mix gently with your (clean) hands. Be careful not to overwork the meat mixture as it may become tough. Form the mixture into 4 patties and set on a plate to rest while you get the grill ready.
Preheat your grill to medium and oil with a paper towel dipped in vegetable oil. Cook the burger patties for 5 minutes on each side; the last couple minutes of cooking add the cheese and a scoop of onions so the toppings heat up. You can also grill the buns, cut side down on the grill, for about 30 seconds to toast them up at this point. The burgers should be at an internal temperature of 165 F when they are ready. Once cooked, remove from heat and let rest for at least 5 minutes before assembling the burgers.
To assemble the burgers, place a patty on the bottom side of each bun. Spread some mayo on the top of each bun, add some greens and cranberry sauce, cover each burger and serve.