1 (3 1/2 oz.) pkg. pistachio instant pudding mix
1 lg. can crushed pineapple, do not drain (about 2 1/2 c.)
1 c. miniature marshmallows
1/2 c. pecan pieces (opt.)
1 (8 oz.) container frozen whipped topping

Mix pineapple with dry pudding mix in large bowl. Add remaining ingredients and refrigerate.