Cut the chicken into small cubes and leave it to marinate in the refrigerator with the curry, chopped garlic, lemongrass, pepper and nuoc mam sauce (at least 30 minutes).
Meanwhile prepare the sauce. Bring all the sauce ingredients to a boil and set aside.
For the vermicelli, bring a good pot of water to the boil. Immerse the vermicelli in it for 2 to 3 minutes. Drain them and arrange them by handfuls on a plate.
Cut the salad into strips and grate the carrots.
Brown the spring rolls in a pan and cut them into small pieces.
Brown the meat in a little oil, over very high heat and very briefly: you simply need to sear the meat to keep it tender.
Serve in large bowls: start with the salad, carrots, soy, then the vermicelli.
Place the spring rolls cut into small pieces and the meat.
You can decorate with chopped coriander, mint and some crushed peanuts.Drizzle with sauce and your chicken Bo bun is ready!