Bokbunja (Korean black raspberry)

Strictly speaking, bokbunja-ttalgi is the plant and bokbunja the name of the dried fruit in herbal medicine, but today bokbunja covers both. The native Korean species is Rubus coreanus, a thorny, deciduous bramble of the rose family that grows wild in the southern half of the peninsula. It flowers in early summer and bears berries that turn red and then black in midsummer. Because the ripe fruit is black, it is also called meokttalgi, "ink berry." The name is written 覆盆子, and its characters ("overturned bowl") gave rise to a famous bawdy folk tale about the berry's supposed potency, which herbal texts reinterpret in terms of kidney and bladder function.

Commercial growing began in South Korea in the late 1960s and expanded into a major cash crop in North Jeolla Province, especially Gochang, along with Jeongeup and Sunchang. Gochang bokbunja and Gochang bokbunja-ju are both registered geographical indications. There is a botanical twist: researchers have shown that most of the berries cultivated in Korea as bokbunja are not native R. coreanus but the North American black raspberry, Rubus occidentalis. That species was planted before the native one was properly identified, ripens a few weeks earlier (June to July instead of late July to August), and is the black raspberry studied and marketed from Gochang today.

The ripe berries are sweet and seedy. Some eat them fresh, but most of the crop becomes juice, syrup, jam and wine; bokbunja-ju, a sweet fruit wine, is the best-known product. Herbal medicine uses the unripe fruit, dried. Modern products range from vinegar and jelly to rice cakes, breads and seed oil.

• Berry nutrients: Per the Korean Food Composition Table, bokbunja provides manganese, vitamin E and potassium. Like other dark berries it is rich in anthocyanin pigments, which are widely studied as antioxidants.
• Specific approval only: In 2022 Korea's food-safety ministry recognized a particular Gochang black raspberry (R. occidentalis) extract as a functional ingredient for blood-pressure regulation, based on animal and human studies. That approval covers that standardized extract; it does not mean eating the berries, juice or wine treats high blood pressure.
• Folk reputation: The berry's fame as a male tonic comes from folk tales and traditional herbal texts, not from established evidence.
• Alcohol: Bokbunja-ju is a sweet wine, usually around 15 percent alcohol, and should be treated like any alcoholic drink.