1 lg. can pineapple chunks, drain and save juice
2 c. mini marshmallows
1/2 c. sugar
1 beaten egg
1 tbsp. flour
1 tbsp. white vinegar
2 c. unpeeled, diced Granny Smith apples
1 1/2 c. salted peanuts, halved
1 (8 oz.) Cool Whip

Mix pineapple chunks with marshmallows and refrigerate overnight. Combine pineapple juice, sugar, egg, flour, and vinegar. Cook until thick. Fold in apples, peanuts, and Cool Whip. Chill.