"In this homemade version of fro-yo, thick Greek yogurt provides the same tangy goodness and soft-serve texture as the neighborhood frozen yogurt joint’s wares, but without the waiting in line. A swirl of blackberries adds fruity sweetness, no fancy toppings necessary. What to buy: We used fresh blackberries in this recipe, but feel free to substitute any fresh, seasonal berries. Game plan: Be sure to get the bowl of your ice cream maker in the freezer and fully frozen before starting this recipe...."