Which ingredient adds a unique flair to the Parmesan Truffle Fries?

The ingredient that adds a unique flair to the Parmesan Truffle Fries is truffle oil. Truffle oil is renowned for its distinct aroma and flavor, which comes from the essence of truffles, a type of gourmet mushroom. This rich and earthy flavor profile enhances the natural taste of the fries and complements the savory notes of the Parmesan cheese. The use of truffle oil elevates the dish, making it more luxurious and appealing to those who enjoy gourmet flavors.

In contrast, the other ingredients like buffalo sauce, BBQ sauce, and gochujang are more commonly associated with different flavor profiles or cuisines and do not provide the same depth or sophistication that truffle oil does in this particular dish. Each of those sauces stands out in their own right but does not contribute to the classic truffle flavor that is key to the Parmesan Truffle Fries.