Gorgonzola cheesecrumbled (blue or feta also work)
Mayonnaiseoptional
2 tomatoessliced
6-8piecesof lettuce
Instructions
In a large mixing bowl, add together the ground beef and turkey and combine thoroughly together. Add the egg whites, garlic cloves, black pepper, salt, balsamic vinegar and bread crumbs. Combine. Cut the white onion into very fine pieces and add the ground meat mixture. Combine the hamburger mixture until all is incorporated and set aside.
Slice the red onion into thin strips. Heat a saute pan to medium high heat and add the butter or olive oil. Once the oil is hot, add the sliced red onions. Continue to saute on high heat for 30-60 seconds and then turn down the heat and continue to saute until the onion begins to soften. Add the balsamic vinegar and sugar and allow the mixture to simmer and the vinegar to start to evaporate. Once the onions are all tender and the balsamic vinegar is cooked down, set those aside.
Slice the tomatoes and lettuce pieces as desired. When ready to cook the hamburgers, patty them out into 1/4-1/2 lb. portions and place on a plate. Heat a griddle or grill to high heat. Place the burgers on the heat and cook until the bottom side is dark, golden brown. Flip the hamburgers and cook on the other side for 10-12 minutes, or until he center of the burgers are cooked through and no longer pink. When ready to serve the burgers, place the burger on a bed of lettuce or spinach. Top with the carmelized onions, tomatoes and sprinkle with some gorgonzola, feta or blue cheese (optional). Serve warm.