In a large bowl of mixer, pour boiling water over gelatin; stir until gelatin is dissolved. Add cold water, mayonnaise, lemon juice and salt. Beat at low speed until blended. Freeze about 25 minutes or until firm, about 1 inch from side of bowl but still soft in the center. Beat at medium speed until fluffy. Fold in diced apples, walnuts and celery. Turn into 1 quart bowl or mold. Refrigerate 1 hour or until firm.
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