Place the steak in a bowl. Mix together the soy
sauce, wine or sherry, sugar and ginger and stir it
into the steak. Leave to marinate for 1 hour.
Remove
the steak from the marinade. Heat half the oil and
stir-fry the bamboo shoots, onion, celery and chili
for 3 minutes then remove them from the pan.
Heat
the remaining oil and stir-fry the steak for 3
minutes. Stir in the marinade, bring to the boil and
add the fried vegetables. Simmer, stirring, for 2
minutes.
Mix together the stock and corn-flour and
add it to the pan. Bring to the boil and simmer,
stirring, until the sauce clears and thickens.