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Thinly slice each onion into rounds.
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Place slices in a large skillet set over medium heat. Cook for about 15 minutes with a lid on, stirring once in a while.
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Take lid off, add in the salt and bacon fat, turn heat to low and cook for another 20-40 minutes, depending on how sweet and caramelized you like your onions.
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Crack fresh black pepper before serving.