Carmel apple dessert

1 ts Apple cider vinegar
      1 tb flour
    1/2 c  Sugar
      1    Egg; beaten
      1    8 oz crushed pineapple
      1    8 oz Cool Whip
      4 c  To 6 cups diced apples
      1    Small bag crushed peanuts
 
  Drain and save pineapple juice. Cook apple cider vinegar, egg, flour, sugar
  and pineapple juice on medium heat for 5 minutes to custard consistency,
  stirring constantly.  Let cool. Mix apples and pineapple first, then add
  custard mixture and cool whip. Refrigerate.  Add nuts before serving.