Jellied Waldorf Salad

1 pkg. (3 oz.) lemon gelatin
1/8 tsp. salt
½ cup mayonnaise
1 cup diced celery
1-½ cup diced apples
½ cup chopped nuts
1 cup frozen whipped topping

Dissolve gelatin in 1 cup hot water in large bowl. Chill until partially set. Add salt and mayonnaise, blending well. Fold in remaining ingredients. Pour into 1 quart mold. Chill until firm.