Worlds Perfect Meatloaf

1 teaspoon prepared horseradish 1 teaspoon dry mustard 1/4 teaspoon salt 1/4 teaspoon pepper 1 pound ground beef, moistened 1/2 onion, finely chopped 1 egg 2 teaspoons Worcestershire sauce 1 cup bread crumbs 1 cup ketchup ...Worlds Perfect Meatloaf