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["Preheat oven to 400u00b0 F, with a rack in the lower middle position. Lay slices of bacon onto a rimmed half-sheet pan without any overlap. Bake the bacon 15 to 18 minutes -- it should be cooked but still a little pliable. Remove the bacon to a paper towel-lined plate. (Do not eat more than one slice!) Pour the bacon fat through a strainer into a jar or other suitable receptacle.", "While the bacon is cooking, prep the onion. Cut the root and leaf ends off, then remove the papery outer skin. Cut the onion in half lengthwise (from cut end to cut end). Cut each half into thin, lengthwise slices.", "Transfer 2 tablespoons of bacon fat into a large saute pan and heat over medium-low. Add the onions, and stir to coat. Cook over medium-low, stirring occasionally, until golden brown and lightly caramelized. It will take about 45 minutes. Lightly season with salt.", "Combine the burger spread ingredients in a small bowl. Mix until homogenous.", "Coarsely chop or crumble the bacon, and transfer to a food processor. Pulse until finely chopped. Combine the chopped bacon, ground turkey, and 1 tablespoon bacon fat in a medium bowl. Mix, using your hands, until bacon is well-distributed through the meat. Divide the mixture into 4 equal portions, and form into patties that are about 5/8-inch thick and between 1/2 and 3/4 inch larger in diameter than the buns. Refrigerate if you will be 30 minutes or longer until you grill the burgers. Season the burgers with salt just before cooking them.", "Heat the grill to high, with coals to 1 side if using charcoal. Clean and oil the grates. If using a gas grill turn off one burner. Assemble the burger ingredients. Brush the insides of the bun with a thin layer of bacon fat (or spread it on if the fat has solidified). Grill the burgers over direct heat, for 3 to 4 minutes per side until cooked through. Watch closely and remove the burgers to indirect heat briefly as needed if more than minor ""flare-ups"" occur. Grill the buns over indirect heat, until lightly toasted, about 3 minutes. When the burgers are a minute or so from being done, apply a slice of cheese to each patty and put the cover on the grill to allow the cheese to soften and start to melt.", "Assemble the burgers: Spread the burger spread on both sides of each bun. Place the patties on the bottom buns. Divide the caramelized onions between the burgers. Cap with the butter lettuce leaves concave side down. Place top buns on. Dig in!"]
