Place the beef, pepper, five spice powder and olive oil in a bowl and mix well to combine.
Melt half the coconut oil in a wok over high heat, add the beef and stir-fry for 5 minutes or until browned. Remove the beef from the wok.
Melt the remaining coconut oil in the wok, add the onion and stir-fry for 5 minutes or until soft and golden. Add the ginger and cook for 1 minute.
Stir in the vegetables, stock and tamari and stir-fry fro 5 minutes or until the vegetables are bright green and tender.
Return the beef to the wok and cook for 3 minutes or until heated through.
Remove from heat and stir in the sesame oil and maple
syrup, if using.
Serve immediately, scattered with rocket, if using