1.Place lamb in a shallow glass or ceramic dish. In a medium jug, whisk together garlic, ginger, rice wine, soy sauce, hoisin sauce, sesame oil and cornflour. Add sauce mixture to lamb; stir until well coated. Cover lamb with plastic food wrap; chill for 1 hour to marinate.
2.Heat a wok or large frying pan over high heat. Add half the oil; swirl to coat surface. Stir-fry lamb, in batches, for 2-3 minutes or until seared. Transfer to a heatproof bowl.
3.Heat remaining oil in wok or pan over high heat. Add onion; stir-fry for 2 minutes or until golden. Add celery and carrot; stir-fry for 1-2 minutes. Return lamb to wok; toss until lamb is heated. Sprinkle with sesame seeds. Serve at once.