Using a food processor or blender, grind the bag of cranberries. Pulse button works well. I like them to to be ground but with some large pieces mixed in.
Drain the can of crushed pineapple very well. It yields approximately 1⅓ cups after drained.
Add the drained pineapple and sugar to the cranberries and mix well. Stir in the marshmallows.
Whip the heavy cream until medium to stiff peaks form. Fold whipped cream into the cranberry mixture.
Refrigerate until serving (at least several hours or up to a day early).
Enjoy!
Recipe by From This Kitchen Table at https://www.fromthiskitchentable.com/cranberry-salad-recipe/