01 - Dissolve lime gelatin in 1/2 cup boiling water. Stir in 1/2 cup cold water and set aside to cool to room temperature.
02 - In a large mixing bowl, combine halved grapes, diced pineapple, diced apple, sliced celery, chopped nuts, and mini marshmallows.
03 - Add cottage cheese, crushed pineapple with juice, whipped topping, and mayonnaise to the fruit mixture. Mix thoroughly until evenly distributed.
04 - Pour cooled gelatin over the fruit and cheese mixture. Stir continuously until gelatin is fully incorporated throughout.
05 - Transfer mixture to a 9x13-inch baking dish or large serving bowl, spreading evenly.
06 - Refrigerate for at least 2 hours or until completely firm and set.
07 - Spread remaining whipped topping evenly over the chilled salad surface just before serving for frosted presentation.
08 - Slice into squares or spoon into serving bowls. Serve chilled for best texture and flavor.