Yōkan

Yōkan is a wagashi (Japanese confection) made of red bean paste, agar, and sugar. It is usually sold in a block form, and eaten in slices. There are two main types: neri yōkan and mizu yōkan. "Mizu" means "water", and indicates that it is made with more water than usual. Mizu yōkan is usually chilled and eaten in the summer, however in Fukui prefecture it is customarily eaten in winter.

Types
Although yōkan found in Japan and abroad is typically made with red bean paste, yōkan made from white kidney bean paste (しろあん, 白餡) is also relatively common. This type of yōkan is milky and translucent with a much milder flavour than that made of red bean paste. As such, it can be effectively flavoured and coloured by using green tea powder.

Yōkan may also contain chopped chestnuts, persimmons, whole sweetened azuki beans, figs, and sweet potato (imo yōkan), among other additions. Sugar can also be replaced with honey, dark brown sugar, or molasses to alter the taste of the yōkan produced. There is also shio yōkan, which uses small amounts of salt.

History
During the Kamakura period (1185-1333), Japanese Buddhist monks who studied in the Song Dynasty brought the tea culture to Japan, and the custom of eating confections with tea began in Japan. The monks also introduced dim sum (点心), a light meal, and the history book Teikin ōrai (庭訓往来) mentions udon (饂飩), manjū (饅頭), and yōkan (羊羹) as tenshin (点心). However, the manjū and yōkan brought to Japan by the monks were not sweets as we know them today, but were prepared in a completely different way. Yōkan was a soup containing sheep meat, but since there was no custom of eating animal meat in Japan, the Japanese replaced the meat with a paste made of kneaded barley or azuki bean flour. Later, the soup was removed and replaced with a pasty confection made of barley or azuki bean flour. Finally, around 1800, during the Edo period (1603-1868), 500 years later, yōkan became what it is today. The invention of agar (寒天) in the 1600s was essential to the birth of modern yokan. Later, the kanten invented in Japan was introduced to Manchuria, Korea and Taiwan.