Combine the steak, salt, sugar, garlic, ginger and lemon grass with the black pepper and marinade over night in a air tight container.

Heat a frypan or wok and add a little oil, add the onion stir-fry until limp but not cooked.

In small batches add the meat mixture until nearly cooked.

Heat the wok to high again and then add all the ingredients, stirring until cooked.

Served with steamed rice.