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Â· just now. 1  Burger King Cooking Oil. 2  Burger king uses Soybean, Canola, and/or Palm oil to fry their fries and onion rings in. 3  Fruits have sugar, it's natural, but some fruits can even be bad for you. 4  Fruits are sweeter and take less effort to arrange, generally, so I tend to eat more fruits.
Chilling them helps the inside of the french fries cook all the way through before the outsides get too dark. Now would be a good time to talk about oil. If you want the short version of the story, here you go: Refined peanut oil is the best oil to use for making french fries. You can also use canola or safflower oil.