Next time you have some leftover McDonald's French fries that have sat out for too long, don't fret! We've got a perfect and easy fix for you.

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Add Yahoo as a preferred source to see more of our stories on Google. McDonald's french fries - Junce/Getty Images It's fair to wonder why McDonald's fries would ever need an In-N-Out-style upgrade.

Three cartons of McDonald's french fries on tray with other food and beverages - In Green/Shutterstock The secret to the delicious flavor of McDonald's fries lies in the chain's meticulous frying and ...