Combine the honeydew, cucumber, sliced scallion, and lime juice. Cover and refrigerate until ready to serve.
Put the 5 cups of cantaloupe, scallion, jalapeÒo, orange zest and juice, lime juice, ginger, and salt in a blender. Process until smooth. Add more salt, orange juice, or jalapeño, if necessary.
Refrigerate the soup until chilled, 2 hours.
Stir the reserved diced melon mixture and divide among small soup bowls. Pour the soup into the bowls. Garnish