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Feels like a CI urban myth, as it would appear to imply one should never cook sugar cured bacon in cast iron lest the seasoning layers created by cooking it contain an undesirable element. Cooked sugar caramelizes, yes, but past a certain temp it will carbonize, the fat will polymerize, and both seem perfectly reasonable building blocks of a good seasoning. Used cooking oil, in fact, for the potential carbon residue from cooked food it contains, is in some ways superior to fresh or refined fats as a manual seasoning.