There's disagreement as to the origin of this beautiful ruby red, blackberry-shaped berry. Some botanists think it's a separate species while others consider it a raspberry-blackberry hybrid. All agree that it was discovered by California Judge J. H. Logan in the late 1800s. Available in June and July, the loganberry is juicy and sweetly tart, and turns purple-red when very ripe. Choose plump, brightly colored berries that are uniform in size. Avoid soft, shriveled or moldy fruit. Do not wash until ready to use, and store (preferably in a single layer) in a moistureproof container in the refrigerator for 2 to 3 days. Loganberries are delicious both cooked and fresh. They make wonderful jams and preserves.