Instead of using simple syrup in the Barrio Viejo, Philip Ward opts for cane syrup (available at cocktailkingdom.com). He says, "For this drink, I wanted the extra richness that cane syrup provides. The three sweeteners I use most often, in increasing amounts of richness, are simple syrup, cane syrup and amber agave nectar. I think of them as small, medium and large."
Plus: Ultimate Cocktail Guide