From http://inthekitchenwithkath.com
Good quality Gin that has been in the freezer (I use Tanqueray)
Lemon
Cocktail onions, and/or olives
Extra dry Vermouth
Pour the gin into a martini glass. Cut a lemon twist from the lemon. Rub the rim of the glass with the lemon twist, and then drop it in the gin. Pour just a very few drops of Vermouth in. Garnish with cocktail onions and/or olives. Give it a quick stir to blend the Vermouth and gin. Serve.