- 6 cups fresh mixed berries (scant 2 pounds), divided
- 3/4 cup sugar
- 1/4 cup fresh orange juice
- 1 vanilla bean, halved lengthwise, or 1 1/2 teaspoons vanilla extract
- 1 cup chilled heavy cream
- 1/3 cup sour cream
- 1/4 cup sugar
- Using a potato masher or the back of a wooden spoon, mash 1 cup berries with sugar and orange juice in a large bowl until sugar begins to dissolve. Gently stir in remaining 5 cups berries; let sit at room temperature, tossing occasionally, until berries are juicy, 1-2 hours.
- Scrape seeds from vanilla bean into a medium bowl. Add chilled cream, sour cream, and sugar. Using a whisk or electric mixer, beat until soft peaks form. DO AHEAD: Cream can be made 30 minutes ahead. Cover and chill.