Truffle fries are a type of French fries that are flavored with truffle oil or seasoned with truffle salt. Truffle oil is an edible oil that has been infused with truffles, which are a type of fungi that grow underground and have a unique earthy flavor. Truffle fries are typically made by preparing French fries, either by baking, deep-frying, or air frying them, and then tossing them with truffle oil or truffle salt. Some recipes also call for adding grated Parmesan cheese or other seasonings to the fries. Truffle fries are a popular side dish in many restaurants and can be made at home with a few simple ingredients.