1 (20 oz.) can crushed pineapple
1/2 c. miniature marshmallows
1 (4 oz.) pkg. instant pistachio pudding
1 (12 oz.) container of Cool-Whip, thawed
1/2 c. chopped walnuts

Put marshmallows in bowl; pour in crushed pineapple, juice and all. Stir until coated. Add pudding and mix thoroughly. Add Cool-Whip, walnuts and fold. Chill well.