I served with Mango and White Rice.
Standard stir-fry beef rely on cornstarch slurries and high-heat wok tossing, whereas this preparation utilizes a longer marinade and direct grilling to build flavor. Cooks frequently butcher flank steak by slicing with the grain, yielding leather-tough strips that resist chewing. Inspect the meat carefully before cutting, locating the parallel muscle fibers running down the length of the cut. Position a sharp chef knife perpendicular to those lines and slice into 1-1/2-inch strips to shorten the muscle fibers. Marinating introduces another hazard. Sugar-heavy sauces char rapidly over intense BTUs, burning before the interior cooks through. Keep the grilling temperature hot, maintain 3 to 5 minutes per side over the coals, and watch for deep caramelization without black char. Overnight marination maximizes penetration, though 4 hours remains the absolute minimum window for adequate flavor absorption. Pair the finished beef with chilled, sliced mango to provide a cold, acidic contrast to the rich, salty marinade and warm white rice.