Pil-Pil sauce is a traditional Spanish sauce, particularly popular in the Basque region. It is made primarily from olive oil, garlic, and red pepper flakes, creating a rich and flavorful condiment. The sauce is often used to enhance seafood dishes, especially cod, and is known for its smooth, emulsified texture. The preparation of Pil-Pil sauce involves gently heating the ingredients to allow the flavors to meld. The name "Pil-Pil" is derived from the sound made during the cooking process, as the oil bubbles and emulsifies. This sauce is celebrated for its ability to elevate simple dishes with its bold flavors.