Or bitters were named after the ethnic group of indians that resisted the spanish conquistadors. They are peruvian bitters are the bitters for a truly authentic pisco sour. Is a complex well balanced combination of over 30 various peels herbs roots s flowers from the peruvian forest â including quina sarrapia leaves both of which appear on the peruvian flag â that are macerated then rested for six months in oak barrels before being bottled. Despite the small amount of bitters used in cocktail recipes they have a very definite effect on the flavor profile of a drink helping to bring the ingredients together. Donâ t that because of the name it will immediately make the drink bitter. In a cocktail works more like adding an herb to a sauce