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Stuffed Burgers

Stuffed Burgers
When stuffed with a savory filling, the basic burger takes on a whole new dimension. This recipe includes four different fillings to choose from. Two of them call for caramelizing a yellow onion, which is easy to prepare: In a fry pan over medium heat, warm 1 1/2 Tbs. olive oil. Add the chopped onion, cover and cook, stirring occasionally, until the onion is completely limp, 10 to 15 minutes. Uncover the pan, reduce the heat to medium-low and cook, stirring frequently, until the onion is golden brown and sweet, 35 to 45 minutes. Let cool before using.

The recipe calls for mixing the ground beef and hamburger seasoning in a large bowl. If desired, you can divide the beef and seasoning between 2 bowls for easier mixing. Be careful not to overmix the ingredients, as this can produce an unpleasantly dense burger.

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 a burger press according to the manufacturer's instructions, or using your hands, form the balls into patties about 1 inch thick. 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.
Williams-Sonoma Kitchen.