[header] How to make a dirty martini [title] Add ice to your cocktail shaker. [step] The shaker should be filled about half to three-quarters full, which will briefly chill the drink as it's mixed. [title] Freeze your martini glasses to keep the drink chilled. 
[step] If you don't have time to freeze the glasses, simply fill them up with ice water for a few minutes while you prepare everything else. Then dump the chilled water just before pouring the drink out.