
Toss sliced flank steak with cornstarch and vegetable oil until evenly coated.
Air fry at 400°F for 10-12 minutes, shaking halfway, until beef is crispy.
While beef cooks, simmer soy sauce, brown sugar, garlic, ginger, and pepper flakes in a small saucepan until slightly thickened.
Remove from heat and stir in sesame oil.
Toss crispy beef with sauce. Garnish with green onions and sesame seeds. Serve over rice.
Tip: The cornstarch coating is key — it creates crispy edges that hold onto the sauce. Slice the steak as thin as possible against the grain. Don't toss with sauce until ready to serve or the coating gets soggy.
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