Use the ripest cantaloupe you can find for his juice from the Food & Wine Test Kitchen. Freezing the fruit before juicing it adds body to the drink. Slideshow: More Summer Drinks
On a rimmed baking sheet lined with parchment paper, spread the cantaloupe and pineapple in an even layer and freeze until just frozen, about 30 minutes.
In an electric juicer, juice the frozen fruit with the ginger and lime. Serve immediately.