In a small mason jar, whisk together fish sauce. Leave to side.
In a large mixing bowl, whisk together garlic, chopped lemongrass, soy sauce, fish sauce, ground ginger, sea salt and black pepper. Add in chicken thighs and marinate for at least 1 hour.
Prepare noodles by preparing according to package instructions. Drain and rinse with cold water. Leave to side.
When chicken is done marinating, preheat pan with sesame or olive oil. Add in chicken and cook for 5 minutes, flipping as needed.
Add on top of vermicelli noodles with fresh lettuce, bean sprouts, shredded carrots and edamame!