With the endless combinations of fruit one can choose from to make a drink, raspberries and blackberries are the best. When these berries are picked from the bushes of California, they bring many shades of the delectable flavors to my glass. Raspberries provide its refreshing sweet flavor, letting the tartness of the blackberries bring a bolder, more defined taste. When the two flavors are linked together, their combination is difficult to resist.