On January 7th, we ate nanakusa-gayu at home. Nanakusa literally means “seven grasses” and “gayu” (kayu, o-kayu) means “porridge.” So basically we ate veggie gruel to mark the official end of the Japanese New Year’s holiday season.
The custom is said to come from China in the early 3rd or 4th century CE. Like many food- and drink-related customs, this one is supposed to bring good health to those who eat it.
