1 (3 3/4 oz.) pkg. instant pistachio pudding
1 can crushed pineapple
1 (8 oz.) or lg. container Cool Whip
1 c. miniature marshmallows and pecans if desired

Pour pineapple and Cool Whip together and stir with a fork; add the package of pistachio pudding. Continue to stir until pudding mix is dissolved. Add miniature marshmallows and pecans if desired. Place in refrigerator for awhile before serving.