Prep the Beef:
In a bowl, toss sliced beef with 2 tablespoons cornstarch and 1 tablespoon soy sauce. Let sit while you prepare the sauce.
Make the Sauce:
In a small bowl, whisk together soy sauce, honey, vinegar, sesame oil, ginger, garlic, and chili garlic sauce. Set aside. Mix cornstarch and water to form a slurry.
Sear the Beef:
Heat oil in a large skillet or wok over medium-high heat. Stir-fry beef in batches for 1–2 minutes per side until browned and just cooked. Remove and set aside.
Cook the Sauce:
In the same pan, add the sauce mixture. Bring to a simmer, then stir in the cornstarch slurry. Simmer for 1–2 minutes until thickened.
Combine:
Return the beef to the skillet and toss to coat in the sauce. Cook 1 more minute until everything is hot and glossy.
Serve:
Spoon over rice or noodles. Top with sesame seeds and green onions.