Instructions: In a large mixing bowl thoroughly combine milk, sugar, whipping cream, lemon peel, lemon juice, lime peel, lime juice, and, if desired, food coloring. (Mixture may appear curdled.) Freeze in a 3- to 4-quart ice cream freezer according to the manufacturers directions. Ripen 4 hours. If desired, garnish with lemon and lime slices and curls.

Makes 2 quarts (16 servings). Make ahead tip: Transfer to freezer container; seal, label, and freeze up to 1 week.

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