Kurojoka, a traditional Kagoshima Prefecture sake vessel used for warm shochu (kanzake). About Kurojoka: Purpose: Primarily used to warm shochu for drinking. It is characterized by its flat shape and a handle wrapped with a vine, and is a ceramic earthenware pot with a lid. Direct Heating: It is thick and heat-resistant, allowing it to be heated directly over a gas stove, etc., to warm the shochu slowly. This brings out the flavor of the shochu. Material/Origin: Many are made of ceramics such as Mino ware and Satsuma ware.