Shake vermouth, sherry, juice, and bitters with ice. Strain into a chilled martini glass. Flame orange peel over top and dust with nutmeg, if you're using it.
The original Adonis is 2/3 Sherry (assumed to be dry), 1/3 Sweet vermouth, 1 dash orange bitters, stirred.
Named for the Broadway musical "Adonis". Probably of 19th century origin, with an unknown creator. This version is in Dale Degroff's "The Essential Cocktail"