Ingredients:

Burger filling options (choose one):

4 bacon slices, cooked until crispy and crumbled.
2 oz. blue cheese, crumbled.

3 oz. feta cheese, crumbled.
Zest of 1/2 lemon,
1 1/2 tsp. minced fresh oregano.

2 oz. feta cheese, crumbled.
1 small yellow onion, diced and caramelized.

2 oz. Roquefort cheese, crumbled.
1 small yellow onion, diced and caramelized.

For the burgers:

2 1/4 lb. ground beef,
5 Tbs. hamburger seasoning,
1 large red onion, sliced 1/4 inch thick.
Olive oil as needed,
6 hamburger buns,
Mayonnaise for serving,
Lettuce leaves for serving,
6 tomato slices.

Directions:


In a small bowl, stir together the filling ingredients of your choice. Set aside.

Place the ground beef in a large bowl and sprinkle with the hamburger seasoning. Using your hands, gently mix the ingredients together; do not overmix.

Divide the beef into 6 equal portions and shape each into a ball. Using your thumb, make a deep depression in each ball; do not push all the way through. Spoon about 1 Tbs. of the filling mixture into the depression. Gently shape the meat around the filling, sealing it inside. Using BurgerMate, place ball in center and form into patties. Transfer the patties to a flexible easy-turn grill basket and set aside.

Put the red onion slices in a shallow bowl and toss with enough olive oil to lightly coat. Arrange on a nonstick grill topper. Set aside.

Prepare a medium-hot fire in a grill.

Place the grill topper on the grill. Cook, turning the onion slices once, until softened and slightly caramelized, 10 to 15 minutes total. Transfer to a plate and cover loosely with aluminum foil.

Place the burgers on the grill and cook, turning once, 5 to 7 minutes per side for medium, or until done to your liking.

Transfer each burger to the bottom half of a bun. Spread mayonnaise on the inside of each top bun. Top each burger with grilled onion slices, lettuce and tomatoes. Serve immediately. Serves 6.