Drain oranges, reserving the juice; add enough water to juice to measure 1 cup. Refrigerate the oranges.
In a large bowl, dissolve gelatin in boiling water. Stir in reserved juice. Add sherbet, stirring until dissolved. Refrigerate for 1 hour or until thickened.
Keep 10 orange segments refrigerated for garnish. Fold remaining oranges into gelatin mixture; cover and refrigerate overnight. Just before serving, garnish with reserved oranges and mint if desired.
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