In a medium saucepan, stir together the flour, sugar, tapioca,
vinegar, and the reserved pineapple juice. Cook over medium heat,
stirring constantly, until thick. Remove from heat and chill.
In a large bowl, combine the pineapple, apples, peanuts, and chilled
tapioca mixture. Fold in the whipped topping and chill for at
least 1
hour before serving.
Makes 12 servings.