Mix beef with lemongrass, fish sauce, salt, black pepper, garlic, shallot and bo kho spices. Marinate for at least 30 minutes, or overnight for up to 24 hours.
700 grams of beef flank, 3 tablespoons lemongrass, 0.5 tablespoon of fish sauce, 0.5 teaspoon salt, 1 teaspoon black pepper, 3 cloves garlic, 1 shallot, 1 packet of bo kho spices
Heat oil in a large saucepan over medium-high heat. Add beef (with marinade) and brown.
1 tablespoon oil
Add the tomato paste and continue cooking the beef until the liquid is reduced.
2 tablespoons tomato paste
Add just enough water to cover the beef
700 ml water
Bring to the boil, then lower the heat until the liquid simmers gently. Simmer for 6 to 8 hours, until beef is tender.
During the last 20 minutes of cooking, add the chopped carrots.
4 carrots
Serve in individual bowls with the noodles of your choice inside. You can also serve with rice or bread.