Dramatically large and dark, blackberries are sweet when ripe - but it can be difficult to find them ripe. Another antioxidant powerhouse, blackberries lend themselves to preserves, pies, cobblers, cakes, and savory dishes where a sweet-tart note is wanted. Make sure to look for berries which are dark, plump, free of mold or damage, and without the stem caps on - it could be a sign that they were harvested too early.