**I prefer to use real vanilla bean (those flecks!) or a non-alcoholic flavoring (since it isn't cooked). For both I use
Simply Organic.
*The amount of sweetener you use will depend on the ripeness / sweetness of your berries and your personal tastes. Keep in mind that treats taste a little less sweet once frozen. I used about ¼ cup (4 tablespoons) sweetener in my testing, which was pleasant and notably sweet, but I think you could go a little lighter with very ripe fruit.