Jakarta Chicken Sates

This is probably the most popular saté in Jakarta—the street food equivalent of, say, a hot dog in New York City. This particular recipe comes from Nurul Phamid, a willowy young man with a faint mustache, who sells his satés from a pushcart on Jabang Street. Phamid loads his satés with chicken livers and chicken skin, as well as dark chicken meat. For the sake of simplicity, I make the liver and skin optional; you certainly could add either