1
Place the cranberries in a food processor and pulse until mostly chopped. Transfer them to a bowl and add the granulated sugar. Refrigerate overnight.
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2
Mix in the drained pineapple, grapes (if using), and mini marshmallows until evenly distributed.
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3
Gently fold in the whipped heavy cream until the mixture is light and fluffy. Chill for an additional 30 minutes before serving.
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