Plus: Ultimate Cocktail Guide
In a medium saucepan, simmer the pineapple juice with the chopped lemongrass over moderate heat for 15 minutes; let cool. Strain the pineapple juice into a jar and chill.
Spear the pineapple wedges with the lemongrass stalks. Fill a pitcher with ice and add the pineapple juice, vodka and lime juice. Strain into chilled martini glasses and garnish with the pineapple.