Ozoni

Zōni , often with the honorific "o-" as o-zōni, is a Japanese soup containing mochi rice cakes. The dish is strongly associated with the Japanese New Year and its tradition of osechi ceremonial foods. The preparation of zōni varies both by household and region. Zōni is written in the Japanese language using two kanji characters. Since the first, 雑 means "miscellaneous" or "mixed", and the second, 煮, means "simmer" or "boil", it is thought that the word is derived from the fact that zōni consists of many miscellaneous items of food (such as mochi, vegetables and seafood) being boiled together. Formerly, amongst samurai society, the dish was referred to as "烹雑" (Hōzō) with 烹 also being an archaic term for "to simmer" or "to boil". It is said that zōni finds its roots in samurai society cuisine. It is thought to be a meal that was cooked on field battles, boiled together with mochi, vegetables and dried foods, among other ingredients. It is also generally believed that this original meal, at first exclusive to samurai, eventually became a staple food of the common people. Zōni was first served as part of a full-course dinner (honzen ryōri), and thus is thought to have been a considerably important meal to samurai.

Source: Wikipedia