Heat oil in a wok over high heat. Stir-fry pork in batches for 2 minutes or until golden. Transfer to a plate. Reserve 2 tbs of the onion for garnishing and add remainder to wok with ginger, garlic, celery and bok choy stalks. Stir-fry for 2 minutes. Add sauce mixture and toss to combine. Return pork to wok with bok choy leaves and cook for 2 minutes or until heated through. Serve with rice, garnished with reserved onions and almonds.