Along with the resurgence of sake, it's no surprise that there has also been steady interest in amazake, the sweetened alcoholic beverage made from sakekasu, the lees of sake production, which is known for being nutritious as it contains vitamins, protein, organic acids, fiber and more. Although it's usually served hot, a sake brewer has found a way to enjoy amazake in frozen form — just in time for Japan's intolerably humid summer.