Instructions

1. Add ketchup and horseradish to a small bowl and whisk to combine. Set aside
2. Combine worcestershire sauce, garlic powder, celery salt, pepper, salt and ground beef in a bowl. Mix to combine making sure to thoroughly spread the seasonings all through the meat. Try not to over mix or you'll end up with tough burgers. Form into 4 patties. Make a well in the center of each of your patties so you don't end up with "the bulge"
3. Heat a grill pan or grill to medium high heat and coat with cooking spray or oil.
4. Add burgers to grill or pan and cook on each side for 3-4 minutes. The amount of time per side you cook your burgers will depend on the thickness of your burger. To make sure your burgers are done, you can carefully insert a meat thermometer and check to see if it reads 160 degrees F, but some of the juices may run, which you may not want OR you can do the finger test. You can read more about that method here, http://www.simplyrecipes.com/recipes/the_finger_test_to_check_the_doneness_of_meat/
5. Assemble your burgers by placing your burger patty on the bottom bun followed by the horseradish ketchup and desired toppings.
6. Top with the other halves of the bun.