fresh chili, cayenne pepper or chili sauce, to taste (optional)
Season the chicken with salt and pepper. Heat a grilling pan over medium high heat. Add some oil and grill the chicken skewers until done, about 7-8 minutes. Drizzle with soy sauce and grill for another minute.
While the chicken is cooking, whisk all sauce ingredients together in a small bowl. Alternatively for a smoother sauce, place all ingredients in a mini food processor or blend with a stick blender. Add more coconut milk or water if the sauce seems too thick.
Serve the hot chicken skewers with the peanut sauce.