Enjoying an aperitif before dinner is a distinctly European tradition, especially popular in Provence and Italy (where it is called an aperitivo). Americans have been reluctant to embrace this practice, but this is changing in our country: bartenders are serving up the classic aperitifs to enthusiastic customers and stateside winemakers and distillers are producing the stuff that define these drinks, namely fortified wines and spirits imbued with herbs and botanicals. So, what is an aperitif?...