Toast 2 teaspoons five-spice powder in a small saucepan over medium heat with 1 tablespoon peanut oil, about 1 minute. Add 1 cup hoisin sauce, 3 tablespoons each honey and rice vinegar, 1 tablespoon soy sauce and 1 cup water. Boil and reduce to 1 1/2 cups, about 5 minutes.