You’ll want to use a tender cut of meat for this beef stir fry recipe. Stir fries are ready in about 10 minutes (the beef cooks for even less time), so you should use a cut of beef that has little to no fat or muscle fibres. I use sirloin steak and slice it against the grain into thin bite-sized slices, but other options for a beef stir fry include tri tip, tenderloin, top loin, flank steak, rib eye and shoulder cuts.