This copycat onion wrapped flying Dutchman is essentially a cheeseburger served in an onion "bun" that is tender, crisp, and sweet, and pairs perfectly well with the richness of the meat.

Ingredient :

• 1 large white onion

• 3/4 pound ground beef round

• 1 teaspoon kosher salt

• 1/2 teaspoon freshly ground black pepper

• 4 slices American cheese, cut into thirds

• 1/4 cup mayonnaise

• 1 tablespoon ketchup

• 1 teaspoon mustard

• 1 tablespoon sweet pickle relish

Directions :

1. Cut 4 1/2 -inch thick slices from the center portion of the onion and discard the smaller ends for another use. Divide beef into 4 portions and form each portion into a very thin patty.  Season patties with salt and pepper. 

2. Heat a large skillet over medium-high heat. Working in batches, add 2  onion slices to the pan and cook, undisturbed, about 2 minutes. Add 2 patties and continue to cook until golden brown, 2 to 3 minutes. Flip onion and burger patties and continue to cook until golden brown pressing the burger as it cooks. 

3. Add 2 cheese slices to the top of one onion slice and both burger patties. Place one burger on the cheese-topped onion slice and top with the second burger patty. Place remaining onion slice over burger and press down. Flip burger and cook 1 to 2 more minutes. Remove from
   pan and set aside. Repeat with remaining onions, burger patties and
   cheese.  

4. Combine mayo, ketchup, mustard, and pickle relish in a small bowl and stir well.  Serve with burgers.