Preheat the grill to medium-high heat, approximately 400°F (200°C).
In a large mixing bowl, combine the lemongrass, fish sauce, honey, vegetable oil, minced garlic, shallot, black pepper, and lime juice to create the marinade.
Add the chicken thighs to the bowl and toss vigorously to ensure all surfaces are coated.
Clean and oil the grill grates to prevent sticking.
Place the chicken on the grill. Cook for 6 to 7 minutes per side, or until the exterior is charred and the internal temperature reaches 165°F (74°C).
Transfer the chicken to a clean plate and allow it to rest for 3 minutes before slicing to retain internal juices.