Soak wooden skewers in water for 20 minutes to prevent burning during the grilling process.
Prepare the lemongrass by removing the tough outer layers and finely mincing the tender inner white core.
In a medium bowl, combine the minced lemongrass, minced garlic, grated ginger, tamari, and sesame oil.
Cut the chicken breast into 1-inch cubes and toss them in the lemongrass marinade, letting them sit for 15 minutes.
Thread the marinated chicken cubes onto the skewers and grill over medium-high heat for 4-5 minutes per side until charred and cooked through.
In a small bowl, whisk together the peanut butter, honey, lime juice, and red pepper flakes with a teaspoon of warm water until smooth.
Thinly slice the cucumber and toss with rice vinegar, sea salt, and black pepper to create a quick pickle.
Serve the hot chicken skewers immediately with the peanut dipping sauce and the chilled cucumber salad on the side.