Messengers of the Incan empire carried an "ocopa", a small bag, filled with a mixture of chilis, peanuts, and herbs to eat when they rested. Today, Ocopa sauce is associated with the city of Arequipa. This recipe is adapted from AARP's Segunda Juventud. It can be difficult to find fresh or dried huacatay outside of latin america. Bottled huacatay paste is the best substitute. Some people suggest combinations of mint and mexican marigold as a distant second best.