Classic Gourmet Burgers with Zesty Sauce

In a bowl, combine the ground chuck and grounded sirloin. Divide the mix into four equal portions and form into patties. Salt and pepper both sides of patties and refrigerate for at least 40 minutes before cooking.

Heat a cast-iron skillet on a medium-high heat. Cook the patties until they are cooked 1/3 of the way up the sides and a dark brown crust has formed. Turn over and top each patty with a slice of cheese. Continue cooking until the cheese is properly melted and the burgers are cooked to your desired doneness.

For the sauce, combine the mayonnaise, ketchup, mustard, dill pickle relish, and hot sauce in a food processor, blend until smooth. Set aside.

Toast each half of the buns lightly. Slather a generous amount of sauce onto the buns. On the bottom bun, stack onion rings, then the burger patty with melted cheese, followed by tomato slices and lettuce. Cover with the top bun.