1. Halve melon, scoop out seeds and remove rind. Cut flesh into large chunks. (You should have about 6 cups.)
2. Working in batches if necessary, combine cantaloupe, honey and orange juice in a blender. Pulse or blend until smooth. Transfer to a large bowl, cover and refrigerate until thoroughly chilled, at least 2 hours.
3. Just before serving, briskly whisk soup and stir in mint. Serve very cold, garnished with sprigs of mint, if desired.
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