Place the steak in a bowl. Mix together the soy
sauce and corn-flour and stir into the steak. Leave
to marinate for 30 minutes.
Heat half the oil and
stir-fry the cucumbers for 3 minutes until opaque
then remove them from the pan. Heat the remaining
oil and stir-fry the steak until browned.
Add the
cucumbers and stir-fry for 2 minutes. Add the stock,
wine or sherry and season with salt and pepper.
Bring to the boil, cover and simmer for 3 minutes.