Zoni

Zōni finds its roots in samurai society cuisine. It is a meal that is cooked during field battles, boiled together with mochi (rice cakes), vegetables and dried foods, among other ingredients.

It is usually a clear soup, with the mochi being shaped round or rectangular depending on the region. Common additions to the soup include chicken, fish or meatballs; leafy vegetables such as komatsuna or spinach; mitsuba (an herb similar to parsley); kamaboko such as naruto and carrot flakes for colour; and flakes of yuzu peel for its citrus fragrance. Regional specialties are often added. A sprinkle of seven-spice chili flakes (shichimi) is sometimes added at the table.

http://en.wikipedia.org/wiki/Zoni_soup