Flank steak is a long, flat cut of beef that is often used for grilling or roasting. It is a flavorful cut of meat, but it can be tough if it is not cooked properly. One of the most important things to do when cooking flank steak is to cut it against the grain. This means cutting across the muscle fibers, which will make the meat more tender.
To cut flank steak against the grain, you will need a sharp knife. Hold the knife at a 45-degree angle to the cutting board and slice the meat into thin strips. The strips should be about 1/4-inch thick and 2-3 inches long.