Can you fry fish and fries in the same oil?

Online Answer
Basically you should consider what you're frying, and what you want to reuse the oil for. If you're frying french fries, then using the same oil for chicken won't be a problem. But if you fry fish, you might not want to use the same oil for french fries, because your fries will then taste like fish.
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Unless a battered fry, they are not adding in salt during the process. I recommend not salting the fries till they come out of the fryer and even then, waiting for an order before salting as the fries can turn limp prematurely if salted too soon..
Ingredients: Potatoes, Vegetable Oil (canola Oil, Corn Oil, Soybean Oil, Hydrogenated Soybean Oil, Natural Beef Flavor [wheat And Milk Derivatives]*), Dextrose, Sodium Acid Pyrophosphate (maintain Color), Salt. *natural Beef Flavor Contains Hydrolyzed Wheat And Hydrolyzed Milk As Starting Ingredients..
Chemicals on the list include dimethylpolysiloxane, sodium acid pyrophosphate, and tertiary butylhydroquinone (TBHQ) — which are all FDA-approved. So to end the clip, Imahara says, "At the end of the day it's not a 'Franken-fry' composed of chemicalsMcDonald's french fries are made from potatoes.
2. Frying fresh-cut potatoes. Soaking peeled, washed and cut fries in cold water overnight removes excess potato starch, which prevents fries from sticking together and helps achieve maximum crispness.