The characters in Mad Men would have mixed their martinis with vodka and just a whisper of vermouth. Neal Bodenheimer prefers to use equal parts gin and vermouth, which makes the drink more food-friendly.
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Fill a cocktail shaker or pint glass with ice. Add the gin, vermouth and bitters and stir until chilled. Strain into a chilled martini glass or coupe. Garnish with the twist and serve.