The only real trick to making a perfect martini is to use really good vodka or gin, and to just show the glass to the vermouth. I'm partial to vodka for my martinis, and recommend Ketel One, Belvedere, or Grey Goose. If you're using Gin, Bombay or Tanquerey is the way to go.
4 - 6 oz. Vodka or Gin
Splash of Dry Vermouth
Spanish Olives or Lemon Zest
Pour a splash of dry vermouth into your martini glass, and swirl it around so as to coat the sides of the glass. Toss the excess down the drain.
Put ice in a cocktail shaker (or pint glass, if you don't have a shaker), and add your vodka or gin. If you don't feel like measuring, fill your martini glass, and pour that into your shaker. If you want to make them dirty, splash some of the olive water/juice into the shaker too.
Put the cap on the shaker (or an inverted pint glass over your pint glass), and shake away for a good 10 seconds.
Strain your chilled vodka or gin into your vermouthed martini glass, and garnish with either a couple of olives or a nice lemon zest.
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