In a gallon-sized freezer bag, combine the flank steak and cornstarch. Seal the bag and shake until the steak is fully coated.
In a small bowl, whisk together the soy sauce, water, brown sugar, garlic, ginger, sesame seeds, sesame oil, and red pepper flakes until well mixed.
Heat 3-4 tablespoons of vegetable oil in a large skillet or wok over medium-high heat. Once hot, add the coated steak and stir-fry for about 3-4 minutes until browned.
Add the broccoli florets to the skillet and stir-fry for an additional 1-2 minutes until the broccoli is bright green and slightly tender.
Pour the sauce into the skillet and stir for about 1 minute until the sauce thickens and coats the beef and broccoli.
Remove from heat and serve hot over rice or noodles, garnished with additional sesame seeds if desired.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3 days.