Season chicken with pepper.
In a bowl, mix the garlic with 2 tablespoons of the cilantro, the fish sauce, sugar and sambal oelek chili sauce. Mix well with chicken strips, making sure chicken is evenly coated. Let stand at least an hour and up to overnight.
Soak bamboo skewers in water for one hour.
Skewer chicken strips.
Grill until cooked through, about 3 minutes on each side.
Serve with lime wedges, if desired.