If you cannot purchase thin chipped beef or sukiyaki beef at the market, cut up your own. Our favorite beef cuts for pho are sirloin steak, round eye, or even filet mignon. Grab your favorited honed (sharpened) knife! To make your life easier, freeze the beef in a baggie or plastic wrap for about ½ hour before attempting to slice. This makes the slicing process easier. Then, cut the beef super then against the grain. Cut it so thin that you can almost see through it. Making sure you have super thin slices of beef ensures that the broth can cook it while it is in your soup bowl. In addition, it ensures the beef will be tender.