ok, I've located a suburban Atlanta Korean restaurant which serves black goat, and here is the authoritative description...
THE MARKETING OF THE GOAT IN KOREA
T. G. Min, K.O. Kong and H. B. Song
College of Natural Resources, Taegu University,
15 Naeri, Jinryang, Kyungsan, Kyungbuk, 712-714. South Korea
Korean native goat (KNG, the black goat) is the only indigenous breed in Korea and the population is about 500,000 heads in about 50,000 farms. The meat of KNG has generally considered goats as a healthy food that helps the seasonal attunement of the human body. With this background, KNG has been consumed much more in processed form like an extract rather than meat itself. For manufacturing the extract, a young goat of 13-15 kg live weight would be used and four or ten different kinds of medicinal herbs added as main herbs and 4-5 kinds herbs needed for supplement. The goat meat and the extract are consumed about 500,000 head each a year. The meat are sold not at ordinary butcher but at specialized restaurant as a type of roasting, cooked meat, or soups and the extract is sold mostly by home visiting and in part health food store. The price of goat is formed about 1.5 times and 3 times expensive compared with beef and pork, respectively. The extract is about 5-6 times expensive compared to other beverages because it is consumed mainly as a medicinal purpose not as a beverage. The consumption of the extract is not increased so far due to the high prices but is expected to increase of that if the medicinal effects are verified scientifically and the prices become low."