Boysenberries are the result of crosses between raspberries, blackberries, and loganberries and are named for Rudolph Boysen, a California horticulturist who experimented with a number of berry hybrids in the 1920s. Although Boysen gave up on commercializing his results, Walter Knott later popularized the unique fruit at his theme park, Knott’s Berry Farm. A dark reddish-purple berry full of anthocyanins and other antioxidants, the boysenberry is reputed to have more than twice the antioxidant power of blueberries. Boysenberries contain ellagic acid, which binds to some carcinogens, including nitrosamines and polycyclic aromatic hydrocarbons, and thus they may help prevent some cancers.Nutritional Facts
One cup of frozen, unsweetened boysenberries provides 66 calories, 16 g carbohydrate, 1.5 g protein, 0.3 g fat, 5.1 g dietary fiber, 88 IU vitamin A, 4 mg vitamin C, 84 mcg folic acid, 183 mg potassium, 36 mg calcium, 36 mg phosphorus, and 21 mg magnesium.