By Paul Nelson –
Last week, you made the pisco sour, a drink that utilizes the white of an egg to create a thick, foamy topping on the drink. Technically, the pisco sour qualifies as a flip, a variety of mixed drink that utilizes all or part of an egg. The term flip is a bartending adjective dating back to the mid-19th century, and there are any number of variations because there are all sorts of potential liquors to work with. The egg adds thickness and creaminess to the drink.