thumb-sized piece ginger, cut into fine matchsticks
4 scallions green end only
200g/7oz pineapple, cut into chunks
handful coriander leaves, to serve
rice and greens, to serve (optional)
Mix the steak, soy sauce, sugar, chili sauce and vinegar together, and set aside for 10 mins. Heat a wok with 1 tsp of the oil.
Lift the steak from the marinade and sear, in batches, then remove. Add a bit more oil and fry the ginger until golden. Add the scallions and pineapple, and return the steak to the pan.
Stir to heat through for 1 min, then add any remaining marinade. Keep stirring until the marinade becomes thick and everything is hot. Serve sprinkled with coriander, and with rice and greens, if you like