4 parts Gin (3 ounces)
1 part Dry Vermouth (.75 ounce)
Shake on ice until cold and strain into a cocktail glass. Garnish with 1 or 2 stuffed green olives. A dash of orange bitters is optional. The quantities in ( ) will nicely fill a 4 ounce cocktail glass.
If you serve the above recipe in an old fashioned glass with ice, it is a "Martini on the rocks." The Martini is one of the classic cocktails. If you only learn to make one cocktail, the Martini should be the one.