A friend of mine gave me a quick and easy recipe for Pistachio Pudding a couple of years ago, and it has been a staple that I take to cookouts and make when we have company over during the Summer.
1 box pistachio pudding mix
1 can crushed pineapple (do not drain)
1 Cup mini marshmallows
1 (8oz) tub of Cool Whip
Mix together the pudding mix and pineapple. Then fold in the marshmallows and Cool Whip. Refrigerate for a couple of hours before serving.