Put sugar and flour in pan - mix vinegar and egg together. Combine vinegar and egg misture with sugar and flour and add pineapple juice over low heat. Stir constantly. When it comes to a boil, remove from heat. Refrigerate for at least one hour.
After sauce cools, combine sauce, apples, Cool Whip and peanuts and serve.
(NOTE: I have found if keeping for a while to add peanuts later so they don't get soggy - just a personal preference)
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