You say potato
I say Vodka
For my daughter's 21st birthday last month, we went to a Korean grill. She wanted a drink, so the waiter suggested "soju", which he aid was pretty much Korean vodka. They flavor it by putting a popsicle in a carafe of soju. Pretty decent. Not too strong, but just enough.
The next week I saw it for sale in a local store. Darned if he wasn't right - it's made from fermented SWEET potato.