1, (10 oz.) bag fresh whole cranberries (about 3 cups)
¾ cup sugar
2 cups miniature marshmallows
1, (20 oz.) can crushed pineapple, drained
1 cup heavy whipping cream
½ cup powdered sugar
1 teaspoon vanilla extract
1 cup pomegranate seeds
Directions
Pulse the cranberries in a food processor until fine and no large pieces remain. Transfer to a large mixing bowl and stir in the sugar. Cover and refrigerate for at least 2 hours or up to overnight.
Drain any accumulated juices from the cranberries and reserve for another use, and then mix in the marshmallows and drained pineapple. Set aside.
Whip the heavy cream in a large mixing bowl (using a stand mixer with the whisk attachment or hand held mixer) until it begins to thicken, about 1 minute, and then beat in the powdered sugar and vanilla until soft peaks form, about 3 to 5 minutes. Gently fold the whipped cream into the cranberry mixture, one third at a time, until fully incorporated. Transfer to an 8-by-8-inch baking dish.
Refrigerate or freeze for about 2 hours. Right before serving, top with the pomegranate seeds.