Combine first 6 ingredients, stirring with a whisk then set aside.
Heat vegetable oil in a large dutch oven over medium-high heat, add beef, browning on all sides. Add broth, green onions, spicy stir fry spice and bring to the boil.
Cover, reduce heat and simmer for 1 ½ hours or until beef is tender. Stir in the bok choy and carrot and cook for a further 5 minutes until vegetables are tender.
Serve beef mixture over hot noodles or fettuccine.