Parboil broccoli for 30 seconds and plunge into cold water immediately to set colour. Add a pinch of baking soda to the water for a brighter green colour.

Cut meat into thin pieces and marinate with ginger, garlic, soy sauce and cornstarch. Add oil to the wok and stir fry onion for 5 seconds. Add broccoli and celery and stir fry 1 min. more. Remove vegetables to platter.

Heat more oil on high and add beef. Fry for 30 seconds or until barely rare.

Quickly mix in reserved vegetables. Add sauce ingredients and toss until bubbly and thickened. Serve immediately with rice (hot).