WTF. Apparently the new trendy, winter drink in Korea is hot grapefruit juice. I was at the Paris Croissant yesterday in Bundang and they had this on the menu and quite a few others had it. It is fresh squeezed Grapefruit juice with sugar that is steamed till hot and frothy. There is no milk added. The taste is a bit like gluwhwien (hot mulled wine) because it has a bit of a tannic taste from the fruit. Ultimately, it is not too bad and I quite enjoyed it. I recommend you get it without sugar.