Classic Cosmopolitans

Place martini glasses in the freezer for at least 15 minutes.

Pour the vodka, Cointreau, cranberry juice cocktail, and lime juice into a pitcher. Fill a cocktail shaker half full with ice. Pour the drink mixture into the cocktail shaker until it’s three-quarters full, cover with the lid, and shake for a full 30 seconds (it’s longer than you think!). Strain the mixture into the frozen martini glasses and serve ice cold. Repeat with remaining drink mixture.