To prepare a the juiciest hamburgers ever recipe, you'll need: 1 pound hamburger patties, 2 tablespoons ketchup, 1 teaspoon paprika, 1/2 teaspoon cayenne pepper, and 1 tablespoon kosher salt. Heat the oil over medium-high heat. Add the ground beef and cook, stirring frequently, until the meat is browned and no longer pink in the center, 8 to 10 minutes. Remove the beef from the pan and set aside. Combine the mayonnaise, mustard, chili powder, Worcestershire sauce, salt and pepper and mix well. Spread the mixture evenly on the buns. Bake at 400?F (204?C) for 20 to 25 minutes, or until golden brown. Serve warm.