As previously mentioned, the best type of steak to use when cooking carne asada is a delicious skirt steak or a flank steak. Both of these types of steaks are well-trimmed and of similar size, so they can be utilized interchangeably. Just keep in mind that flank steak is the lean version full of intense flavors while a skirt steak is more stringy and fibrous but also full of intense flavors. Both flank steaks and skirt steaks are ideally cooked at a rare or medium-rare amount in order to prevent them from becoming chewy and too tough to bite into. Also, be sure to cut your choice of steak against the grain, this will make it easier to bite into and to chew.