- Marinate the beef for 1 hour in 1 teaspoon oil, 1 teaspoon soy sauce, and 1 tablespoon cornstarch. Dredge the meat in the remaining 1/4 cup of cornstarch until lightly coated.
- Heat 1/3 cup oil in the wok over high heat. Just before the oil starts to smoke, spread the flank steak pieces evenly in the wok, and let sear for 1 minute (depending upon the heat of your wok). Turn over and let the other side sear for another 30 seconds.
- Remove to a sheet pan; tilt it slightly to let the oil drain to one side (lean it on a cookbook or cutting board). The beef should be seared with a crusty coating.
- Drain the oil from the wok, leaving 1 tablespoon behind, and turn the heat to medium-high. Add the ginger and dried chili peppers, if using.
- After about 15 seconds, add the garlic. Stir for another 10 seconds and add the soy sauce and chicken stock (or water). Bring the sauce to a simmer, add the brown sugar, and stir until dissolved.
- Let the sauce simmer for about 2 minutes and slowly stir in the cornstarch slurry mixture–until the sauce coats the back of a spoon. Add the beef and scallions and toss everything for another 30 seconds.
- There should be almost no liquid as the sauce should be clinging to the beef. If you still have sauce, increase the heat slightly and stir until thickened.
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FULL LIST OF INGREDIENTS AND COMPLETE COOKING INSTRUCTIONS.