Cut the meat across the grain into thin slices. Mix
together the wine or sherry, soy sauce, oyster
sauce, sugar, corn-flour, bicarbonate of soda, salt
and garlic.
Stir in the meat, cover and refrigerate
for at least 3 hours. Heat the oil and stir-fry the
onions for about 5 minutes until golden brown.
Transfer to a warmed serving plate and keep warm.
Add some of the meat to the wok, spreading the
slices so they do not overlap.
Fry for about 3
minutes on each side until browned then arrange on
top of the onions and continue to fry the remaining
meat.