Carne asada is a type of grilled and marinated beef, most commonly made with skirt steak or flank steak. These cuts are popular because they are thin and cook quickly, producing a flavorful and tender result when grilled. Skirt steak tends to be thinner with more fat content, giving it more flavor, while flank steak is thicker and leaner but still a good choice for carne asada. Sometimes other cuts like flap steak or chuck steak (diezmillo) are also used, but skirt and flank are the traditional and most favored options for making carne asada.