In a large bowl, mix marinade ingredients together with beef, cover and refrigerate for an hour or up to overnight.
On a high heat, add beef into a wok or pan and stir fry for a couple of minutes or until the beef is just cooked. It’s ok for it to be a little pink. Remove from heat and set aside.
In the same pan, stir fry capsicum, pak choy and peas, add back in beef, then stir through coriander and shallots.
Serve with rice.