In order for tofu that is frozen during the night not to thaw during the day, it's placed in a separate ice room and allowed to mature for a few days, and after thawing it is dried.
夜間に凍結した豆腐が日中に溶けてしまわないように、専用の氷室に入れて数日間熟成させ、その後に解凍し乾燥させる。