Cut stewing beef and carrot into cubes. Mince garlic and ginger. Finely chop green onions, chili, and cilantro. Cut beef loin into very thin slices.
Briefly sear cubed beef in batches in some vegetable oil. Deglaze with beef stock. Add fennel seed and let simmer for approx. 25 – 30 min. Add rice noodles, carrot, garlic, ginger, chili, and fish sauce and simmer for approx. 5 – 8 min. or until the noodles are tender.
Add sliced beef and green onions and simmer for approx. 3 – 5 min. until the beef is just cooked. Add cilantro, salt, and pepper to taste. Enjoy!