01 -
Heat a large sauté pan over medium-high heat. Add the bacon and cook, stirring occasionally, until browned but not crispy, about 8 minutes. Remove the bacon from the pan with a slotted spoon and drain on a paper towel-lined plate.
02 -
Drain all but 2 to 3 tablespoons of bacon grease from the pan. Stir in the onions, about ¼ teaspoon Kosher salt, and a pinch of black pepper. Cover the pan and cook the onions for 2 minutes. Uncover, add a splash of water, and scrape the pan with a spatula or wooden spoon to release browned bits. Recover and cook for 10 minutes, stirring occasionally, until onions are soft and lightly browned.
03 -
Stir in balsamic vinegar, mustard, and water. Return the cooked bacon to the pan and bring the mixture to a simmer. Simmer uncovered until the sauce thickens and is almost completely absorbed, about 2 to 4 minutes. Transfer jam to a bowl or refrigerate for up to 2 days.
04 -
In a medium bowl, mix finely diced bacon, ground beef, Worcestershire sauce, Kosher salt, and black pepper using a fork. Shape into four equal-sized patties, about 1 inch thick.
05 -
Preheat grill to medium-high. Cook patties for 4 to 5 minutes per side. Once flipped, add cheddar cheese to the burger patties. Let rest for 5 minutes after cooking.
06 -
Top the cooked patties with bacon onion balsamic jam and assemble with buns. Serve immediately.