The traditional Japanese vegetarian style is called 'Shojin Ryori' . We usually had shojin bento at temple ceremonies or funerals. 

You can taste the bento box food and find out the history (episode) behind.

Shojin Ryori (vegetarian cuisine) is based on Buddhist precepts (prohibition of killing) and is made solely from plant-based ingredients, primarily vegetables, grains, seaweed, and processed soybeans, without using animal products such as meat, fish, or eggs. As part of ascetic training, it is a traditional and healthy diet that purifies the body and mind, with consideration given to flavor and nutritional balance (the five tastes, five colors, and five methods).

Includes a self made Bento Box to take away.