How to Make It
Combine 1 cup berries, 3/4 cup yogurt, milk, mint, and agave syrup in the bowl of a food processor; process until smooth. Spoon into a freezer-safe container. Add remaining 1 cup berries and remaining 1/4 cup yogurt to processor; process until smooth. Swirl berry mixture into yogurt mixture. Serve immediately, or freeze until firm.