Mix hoisin, soy sauces, rice vinegar, brown sugar, and optional five‑spice in a bowl. Whisk until smooth so the sauce has depth and balance. Set aside to let the flavors mingle.
Heat your skillet over high heat and add oil. Add minced beef and let it brown without stirring at first so you get lovely caramelization before breaking it up.
Stir in the garlic and grated ginger and cook for about 30 seconds. The kitchen will smell incredible as those sharp flavors join the beef.
Pour the sauce over the browned beef. Let it simmer so it coats every bit of meat in flavor. Stir in the cornflour slurry and cook until the sauce thickens and becomes glossy.
Serve the sticky beef over hot jasmine rice. Top with fresh cucumber ribbons, sprinkle spring onions and sesame seeds, and drizzle sesame oil for fragrance.