1. Line a large baking sheet with parchment. Spread cantaloupe in a single layer and freeze until firm, at least 4 hours and up to overnight.
2. In a medium bowl, whisk together lime zest and juice and honey until honey dissolves.
3. In a blender, combine cantaloupe, lime juice mixture and 1½ cups cold water and blend until smooth, working in batches if necessary. Pour into 4 glasses, sprinkle with lime zest and serve.