Reserve 1/2 cup of pineapple juice from the crushed pineapple can.
In a large bowl combine the pineapple in its remaining juice with the pudding. Mix until well combined and all of the pudding has dissolved.
Stir in marshmallows and pecans.
Fold in the whipped topping.
If it needs more liquid add the reserved juice a tablespoon at a time until you reach your desired consistency. Add a couple drops of green food coloring if desired to get a darker green color
Refrigerate at least 1 hour, but it is best overnight (6-8 hours).
Serve with a dollop of cool whip and a maraschino cherry.
Video
Notes
For a lighter dish, you can substitute sugar-free instant pudding and Cool Whip Free.To thaw the Cool whip, place the container in the refrigerator for about 4 hours.Fun add-ins: 1/2 cup shredded coconut, 1/2 chopped maraschino cherries, try your favorite nuts instead of pecans (walnuts, pistachio nuts, sliced almonds, etc). Try adding drained fruit cocktail or mandarin oranges. The possibilities are endless.