With the back of a spoon, smash the lemongrass, cut into large pieces so you can remove it before cooking.
In a mixing bowl, combine lemongrass, minced garlic, lime juice, lime zest, sriracha sauce, soy sauce, rice vinegar, sesame oil, cilantro and maple syrup. Whisk vigorously until all the ingredients are combine.
Place the chicken thighs in the bowl and mix them gently with the marinade, ensuring each piece is well-coated Allow the chicken to marinate in the refrigerator for at least 1 hour, or for maximum flavors, let it rest overnight.
Preheat your grill to medium-high heat and lightly oil the grates to prevent any stickiness.
Take the marinated chicken thighs out of the marinade and place them on the preheated grill. Grill each side for about 8-10 minutes, or until the chicken is cooked through.
Once the chicken is cooked , transfer it to a serving platter, letting the chicken rest for a few moments.
Generously sprinkle more fresh cilantro, if desired.
Notes
For oven method, bake at 425 degrees F for 20-25 minutes, flipping halfway through.The marinade keeps in the fridge for up to 3 days if made in advance.Leftover chicken stores in the fridge for up to 4 days or can be frozen for up to 3 months.