The heart of Best Spicy Thai Lemongrass Chicken is the marinade. Gingery with soy sauce and lemongrass, this recipe makes for a spicy and unforgettable version of a restaurant favorite.
Mix all of the ingredients for the Lemongrass Marinade. Chop the stalks of lemongrass. Add only 2 tablespoons of the fresh chopped lemongrass stalk to the marinade. Set the remainder aside for later. Stir the marinade until fully combined. Reserve half of the marinade and set aside.
Slice the boneless skinless chicken into thin 1-inch strips and add to a mixing bowl. Pour half of the marinade over the boneless skinless chicken and stir until fully combined. Allow to sit for at least 10 minutes.
In the meantime, chop the Thai chilis and garlic. Thinly slice the purple onion. Add the corn starch to the remaining marinade and stir to make a slurry. Set aside.
Heat a pan sprayed cast iron skillet on medium heat. Add vegetable oil. Add all of the marinated chicken to the pan. Allow to cook for 15-17 minutes, stirring occasionally. Turn the heat up to medium high. Allow the chicken to cook for an additional 5-6 minutes until cooked through and until the desired browning and caramelization is reached.
Turn the heat back down to medium. Add the remaining chopped lemongrass stalk, Thai chilis, garlic and purple onion. Cook for 2-3 minutes while stirring to combine with the chicken. Add the Lemongrass Marinade slurry and stir for two minutes. Serve with Jasmine rice and enjoy!