Trader Joe’s Choice Premium Angus Beef Flank Steak is one of four cuts we offer on the Choice Grade tier— the grade just below USDA Prime (usually found only in fine restaurants). Flank Steak comes from the well- exercised abdominal part of the hindquarter. That means this longer, thinner cut has a fair amount of connective tissue, which makes it perfect for London Broil, where marinating contributes to a more tender Steak. This cut is also very popular for fajitas and for Asian stir-fry dishes.