Salisbury Steak Burgers with Sweet Potato Fries 
Yields: 6 serving(s)
Prep Time: 40 mins
Total Time: 40 mins
Ingredients:
2/3 cup mayonnaise
2 Tbsp. ketchup
2 Tbsp. brown mustard
2 tsp. Worcestershire sauce
1/2 cup 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
Directions:
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.
Combine the beef, crumbled bouillon, salt, a few grinds of pepper, the remaining 1 tablespoon each of 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.
Melt 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.
Meanwhile, 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.
Preheat 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.
Recipe courtesy of The Pioneer Woman.com