Mix half the corn-flour with the egg whites. Add the
steak and mix to coat the beef in the batter.
Heat
the oil and deep-fry the steak until browned. Remove
from the pan and drain on kitchen paper.
Heat 15 ml/1
tbsp of oil and stir-fry the celery and onions for 3
minutes.
Add the meat, water, salt, soy sauce, wine
or sherry and sugar and season with pepper. Bring to
the boil and simmer, stirring, until the sauce
thickens.