1/4 cup unsalted ketchup
2 teaspoons prepared horseradish
2 tablespoons Worcestershire sauce
1 teaspoon garlic powder
1/2 teaspoon celery salt
1/2 teaspoon freshly ground black pepper
3/8 teaspoon kosher salt
1 pound 90% lean ground sirloin
4 (1 1/2-ounce) whole-grain hamburger buns
8 romaine lettuce leaves
1 dill pickle spear, thinly sliced crosswise
DirectionsCombine ketchup and horseradish in a small bowl, stirring with a whisk.
Combine Worcestershire, garlic powder, celery salt, pepper, salt, and beef in a bowl; gently blend with your hands. Form mixture into 4 (3 1/2-inch-diameter) patties.
Heat a grill over medium-high heat. Coat grate with cooking spray. Add burgers to grill; cook 2 to 3 minutes on each side or until desired degree of doneness. Place 1 burger on bottom half of each bun. Top burgers with ketchup mixture, lettuce, and pickle. Top with top halves of buns.