I honestly believe there is no better way to experience a culture than through its food, and always try to stop by a local market when traveling. The Mercado San Pedro is a local market in Cusco and basically has everything you would need. The market is big, the length of about 3 blocks, and a block wide, and packed with vendors. It has aisles upon aisles of fruit, vegetables, food stalls, food products, pastries, juices, herbs, textiles, and all sorts of other stuff.