Combine all of the marinade ingredients in a bowl. Slice the steak into strips and add to the bowl ensuring that it is all coated. Cover and pop in the fridge while you prep the vegetables.
Cut all of the vegetables into even strips (julienne) ready for stir frying.
Heat a small glug of oil in the wok (or large frying pan if you don't have one) on the highest heat. Let the oil get super hot.
Add the onions to the wok for a minute or two to soften, keep moving them around in the wok as they cook. Add in the beef along with all of the marinade and cook for a couple of minutes, again, keep stirring.
Once the beef has coloured, stir in the vegetables and cook for 3 minutes until they have softened, but still crunchy
Garnish with spring onions and some chilli slices. Serve immediately with rice or noodles
Stir fry's are a great dish for experimenting with. Try adding in some baby sweetcorn or mange tout!
Keep stirring the ingredients in the wok during cooking to ensure an even crunch.