In-N-Out Double-Double and Frisco Melt Inspired Sandwich

Start by caramelizing your onions in olive oil over low heat for 45 minutes to an hour. Combine your beef, bacon, salt and pepper and form into 4 patties. Press the center of the patty with your thumb as the center will rise as it cooks! Cook over medium heat on a grill or oiled cast iron pan for 3-4 minutes each side. Once you flip, top with cheese and cover until it melts. Remove patties from the pan then add your buttered bread until crispy. For the sauce, combine 1/2 cup mayo, 2 tbsp relish (or minced pickles), 3 1/2 tbsp ketchup, 1 tsp white vinegar, 1 tsp coconut sugar (or regular), and 1/2 tsp salt. Assemble your melt by adding the burger, onions and spreading on the sauce.