Salisbury Steak Burger With Sweet Potato Fries

Ingredients

• 2/3 c. 

  mayonnaise 

• 2 tbsp. 

  ketchup

• 2 tbsp. 

  brown mustard

• 2 tsp. 

  Worcestershire sauce

• 1/2 c. 

  fresh parsley, chopped

• 2 lb. 

  ground beef

• 1/2 

  beef bouillon cube, finely crumbled

• 1/2 tsp. 

  kosher salt

• Black pepper, to taste

• 6 tbsp. 

  salted butter

• 2 

  large onions, thinly sliced

• 1 

  16-ounce package frozen sweet potato fries

• 1 tbsp. 

  olive oil

• 1 tsp. 

  garlic salt 

• 1/2 tsp. 

  paprika

• 6 

  sesame hamburger buns, toasted

Description

1. Mix the mayonnaise, 1 tablespoon each ketchup and mustard, 1 teaspoon Worcestershire sauce and the parsley in a medium bowl. Refrigerate until ready to serve.
2. 2Combine the beef, crumbled bouillon, salt, a few grinds of pepper, the remaining 1 tablespoon each ketchup and mustard and the remaining 1 teaspoon Worcestershire sauce in a large bowl. Use your hands to mix until just combined. Divide the mixture into 6 equal balls, then press into patties. Place on a parchment-lined baking sheet and set aside.
3. 3Melt the butter in a large skillet over medium heat. Add the onions and cook, stirring occasionally, until softened and browned, 13 to 15 minutes. Remove the onions to a plate.
4. 4Meanwhile, preheat the oven to 450˚. Toss the fries with the olive oil, garlic salt and paprika on a baking sheet; spread in an even layer. Bake until crispy, 22 to 25 minutes.
5. 5Preheat a grill or grill pan to medium high. Grill the burgers (in batches, if necessary) until well marked, 4 to 5 minutes per side for medium rare. Spread a heaping tablespoon of the mayonnaise mixture on both sides of the buns. Put the burgers on the buns and top with the onions. Serve with the fries.