Combine gelatin, sugar, and salt in a saucepan. Stir together eggs, lime juice, and water, and add to gelatin mixture. Cook and stir over medium heat just until mixture comes to a boil. Remove from heat; add lime zest and food coloring. Chill, stirring occasionally, until mixture mounds. Fold gelatin mixture into whipped topping. Carefully fold in melon cubes. Pile into cooled pastry shell. Chill until firm.
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