In a small bowl, prepare the sauce by whisking together the soy sauce, honey, cornstarch, and red pepper flakes. Set aside.
In a large skillet, heat the oil over medium-high heat.
Add the beef and cook, stirring, until no longer pink, breaking it into crumbles as you cook, about 5 minutes.
Drain the beef and return it to the skillet. Add the garlic and ginger and cook, stirring, for 1 minute.
Stir the sauce into the beef. Cook for 2 more minutes, until heated through and the sauce thickens.
Off heat, drizzle the dish with sesame oil, sprinkle it with sliced green onions, and serve.
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Notes
I highly recommend using lean ground beef (85% lean and 15% fat) in this recipe. Don't go any leaner than that, or it will be too dry and not as flavorful.
Sesame oil is a must. It greatly enhances the dish, so please don't skip it. Don't use refined sesame oil - it's nearly flavorless. Toasted sesame oil is best.
If using a sugar-free honey substitute, each serving of this recipe contains 3 grams of carbs.
You can keep the leftovers in a sealed container in the fridge for 3-4 days. Reheat them covered in the microwave at 50% power. You can also cool the leftovers completely and freeze them in a freezer-safe container for up to three months. Thaw them overnight in the fridge before reheating.