How long have I got, doc?
How long does it take for good fry oil to turn bad you mean? That depends on a number of factors, chief among them the type of oil/fat you’re using. In general, you want a frying medium that’s fairly stable (i.e. resistant to breakdown) and neutral flavor-wise. For me that means either vegetable or canola oil. Solid fats like shortening or lard are even more resistant to breakdown, but are less convenient for the home fryer.
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