Create a sauce by whisk together the mayonnaise, mustard, pickle juice, and Cucina Antica Organic Ketchup in a small bowl.
Shaped the ground chuck into four 1 inch thick patties. Season generously with salt and pepper and brush with olive oil. (Do not add the seasoning until after patties are formed.) Grill over moderately high heat until well-browned on the bottom, 5 minutes. Flip the burgers, place the cheese on top and grill for 4 minutes longer, until the cheese is slightly melted and the burgers are medium-rare. Spread the sauce created earlier on the cut sides of the buns; set the burgers on the bottoms and top with lettuce, tomato, onion, and pickles. Close the burgers and serve right away.
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