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Mix all the ingredients for the fry sauce in a small bowl or jar. Refrigerate the sauce until ready to use.
Heat the butter in a cast-iron skillet over medium heat.
Once melted, lower the heat and add the diced onions. Cook them until they turn dark golden brown, approximately 10 minutes. Stir occasionally.
Once the onions are done, remove them from the skillet and set them on a plate.
Start by portioning out 4 (2-ounce) ground beef patties. Flatten them until they are about the width of your fist. Season the patties with salt and pepper.
Increase the heat to medium and place the burger patties in the same skillet where you caramelized onions.
Cook for 2-3 minutes per side.
Once you flip, brush the tops of each burger with a teaspoon of yellow mustard. Flip, then place a slice of cheese on top of two of the burgers. Cover the skillet and cook for 2-3 minutes while the cheese is melting.
Assemble the Keto Burgers - if using a bun, simply stack from the bottom up...tomato, pickle, a patty with cheese on top, the other patty, fry sauce, and onions. If using lettuce, simply do the same order and wrap in lettuce.