You'll need a fork and a spoon to enjoy this meal. You can use most any greens in place of the bok choy, including spinach or Napa cabbage.
Combine first 6 ingredients, stirring with a whisk; set aside.
Heat vegetable oil in a large Dutch oven over medium-high heat; add beef, browning on all sides. Add broth mixture, green onions, garlic, and ginger; bring to a boil.
Cover, reduce heat, and simmer for 1 hour and 30 minutes or until beef is tender. Stir in bok choy and carrot, and cook 5 minutes or until tender. Serve beef mixture over noodles.
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