Cut the chicken meat into small cubes. Blend the Marinade ingredients in a food processor. Add in a little water if needed. Marinate the chicken pieces for 6 hours or best overnight. Thread a few pieces of the chicken meat onto the bamboo skewers and grill for 2-3 minutes on each side until nicely charred. Baste and brush with some oil while grilling. Serve hot with the fresh cucumber pieces and onions.