Slice your beef and put in a mixing bowl. For added tenderness, give each piece a bash with the back of a knife. Add the marinade to the bowl and massage into the beef. Marinate for 1-24 hours.
Prepare your ginger, garlic, spring onions and coriander
Mix the sauce ingredients together well.
Season cornflour with pepper and man grind
Throw the cornflour on the beef and massage well until all beef is coated. It will be a sticky texture.
Heat 3 tablespoon oil on medium-high in a wok or large frying pan. When hot, add your ginger and spring onion, then chilli and garlic, then beef, in batches so the wok doesn’t lose heat. Fry the beef, stirring often, for about 2-3 minutes until browned. Remove and put on paper towels, keep warm. Continue until all beef is cooked.
Throw all cooked beef into the wok on high. Throw in the sauce and toss for a minute or two until saucy and sticky
Remove. Garnish with spring onion and coriander.
Serve with rice and your favourite greens.