Blackberries are characterized by their coloring, their unique composition and their flavor. Like raspberries, Blackberries are not technically a berry, but rather an aggregate fruit of individual drupes held together by very fine, nearly invisible hairs. Blackberries do not have a hollow center, instead they have a solid, edible core. When ripe, Blackberries have a deep inky sheen with purple highlights. They are succulent, soft, and juicy. Their flavor is sweet, slightly tart, with earthy undertones.