King Burgers PT30M https://img3.recipesrun.com/201907/2019/1107/de/b/623193/300x200x90.jpg Hamburgers are popular food, not only because they are easy to make, but also because they are delicious. The sauce for this juicy burger tastes even better when it's been refrigerated overnight. 6 servings Ingredients: Optional toppings: Shredded lettuce, sliced tomato and red onion 3 tbsp. butter, softened 6 hamburger buns, split 2-1/2 tsp. hamburger seasoning, divided 1/3 cup beef broth 1-1/2 pounds ground beef 1/8 tsp. pepper 1/8 tsp. salt 2 tbsp. Dijon mustard 2 tbsp. prepared horseradish 1/4 cup mayonnaise 2 tbsp. butter