Prepare the beef by cutting it into fine slices. Mix together the soy, mirin, finely chopped garlic and ginger, chopped coriander and the finely sliced chilli and stir the meat into the mixture. Allow to marinade for around half an hour as a minimum.

Prepare the pak choi and spring onions by removing any old leaves, slicing or tearing the pak choi lengthwise and the spring onions into half cm dice.

Rinse the noodles under a running tap of tepid water for a minute or two, before tipping into a bowl and covering with boiling water. Drain after 3 minutes and put to one side

Heat the oil in a wok and add the beef with marinade. Stir fry for 2-3 minutes before adding in the vegetables and cooking for a further minute.

Add the noodles which should still be warm and stir through for a minute before serving