Pineapple Cosmopolitans

In a large jar, combine the pineapple and vodka. Cover and let stand at room temperature until the vodka is well flavored with pineapple, about 3 days.

Strain the vodka through a fine sieve into a pitcher. Add the cranberry and lime juices and the crushed ice and stir well. Strain into chilled martini glasses and serve garnished with lime slices.