It would not surprise me in the least if this were the most well stocked and comprehensive grocery…read morestore specialising in East Asian products in all of Germany. Heng Long may be a little more out of the way than other Asian groceries in Köln, but I will always go out of my way to go there.
On my first visit I had a list of: makgeolli, rice flakes, peanut paste without sugar or palm oil, sliced refrigerated rice cake, aloe vera drink, dried bean curd sheet, etc. The store had exactly everything I was looking for and more. They also stock gifts, novelties, and cooking instruments.
From me to you, it doesn't get better than Heng Long!