1/2 (14.5 oz.) pkg. Acini de Pepe macaroni
1 beaten egg yolk
1/2 c. sugar
1 tbsp. flour
3/4 c. + 2 tbsp. pineapple juice
2 c. miniature marshmallows
8 oz. Cool Whip
8 oz. drained, crushed pineapple
8 oz. drained pineapple tidbits
2 (10 oz.) drained mandarin oranges

Cook and drain macaroni. Rinse with cold water. In a medium saucepan, combine the next 4 ingredients. Cook on medium heat, stirring constantly until thick. Cool and pour over macaroni. Stir in the remaining ingredients and chill.