[header] How to reheat french fries [title] Pre-heat the oven to 450 degrees fahrenheit (232 ° c). [title] Cover an oven-safe rectangular metal tray with tin foil. [step] Tin foil is also known as aluminium foil. 
Covering your baking sheet with tin foil will ensure that your fries don't stick to the sheet when they are reheating and it makes cleanup much easier. [title] Put your french fries on the baking sheet.