A staff member places cups with Pisco Sour at the Peru corner in the Pentagonito COP 20 conference center in Lima, capital of Peru, Dec. 2, 2014. Pisco Sour is a kind of typical cocktail in Peru. The Peruvian Pisco Sour uses Peruvian pisco as the base liquor and adds lemon juice, syrup, ice, egg white to enhance the flavor. (Xinhua/Xu Zijian)