Shochu

These are Imo-jochu(shochu) made from sweet potato with good reputation.

Shochu is distilled liquor normally made from sweet potato, oats, rice or buckwheat, but can be from anything edible. It may be originally from Kyushu area, west part of Japan. Shochu is as much common as Sake.
We enjoy Shochu with ice, water, hot water and umeboshi (pickled Japanese plum).