Heat up the oil and brown
the beef before blanching it in a pot of boiling water for a few
seconds.
Pour the water away and
cover with fresh cold water, add onions, ginger root, five-spice
powder, sugar, soy sauce and rice wine or sherry, and place a
tightly fitting lid over the pan.
Bring it to the boil over
a high heat then reduce the heat and simmer gently for 3-4 hours,
after which there should be very little juice left.