1 lg. can crushed pineapple in its own juice
1 sm. box pistachio pudding (dry)
1/2 c. pecans
2/3 c. marshmallows
1 (12 oz.) Cool Whip

Mix pineapple and dry pudding in a large bowl. Then add pecans and marshmallows, mixing well. Fold in Cool Whip. Refrigerate.