In 2 batches in a food processor, puree the melon, mint, 2 1/2 tablespoons of the liqueur, lime juice and sugar. Taste for acidity, you may add more lime juice here if desired. Place in a pitcher or bowl and refrigerate until well chilled.
In a bowl, toss the cantaloupe balls with the remaining 1/2 tablespoon liqueur and let macerate in the refrigerator.
Cut each breadstick in half crosswise and wrap each piece with a slice of ham.
To serve, ladle the soup into 4 shallow bowls. Swirl 1 1/2 teaspoons of the crème fraiche into the center of each serving and arrange a portion of cantaloupe decoratively in each bowl. Arrange 2 breadsticks on the rim of each bowl, and serve. Garnish with fresh mint springs.
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