Easy Meal
Flank steak requires a deliberate physical transformation to withstand high-heat pan-frying without turning rubbery. Slicing beef across the muscle fibers shortens the protein strands, creating a naturally tender bite. Freezing the cut for twenty minutes beforehand stiffens the tissue just enough to yield uniform quarter-inch strips. Tossing those strips in cornstarch creates a protective carbohydrate barrier. This starch layer absorbs moisture from the surface of the meat and forms a crisp crust when it hits hot oil. Without this dry coating, the beef would steam in its own juices rather than brown.
Stir-frying relies entirely on rapid thermal transfer. A crowded skillet drops in temperature and releases accumulated liquid, boiling the protein instead of searing it. Frying the coated beef in batches ensures the oil stays around 375 degrees Fahrenheit. Drain the fried meat on paper towels to eliminate excess surface grease before returning it to the pan. Broccoli florets demand separate handling. Steaming them beforehand prevents the watery vegetables from diluting the reduction sauce. Combining the components rapidly at the very end locks in texture.