A Negroni is an Italian cocktail, made of one part gin, one part vermouth rosso (red, semi-sweet) and one part bitter, garnished with orange peel. It is considered an aperitif. A traditionally made Negroni is stirred, not shaken; it is built over ice in an old-fashioned or rocks glass and garnished with a slice of orange. Outside of Italy, an orange peel is often used in place of an orange slice. The drink's origins are not known with certainty. The most widely reported account is that i...