The provided source material does not contain information regarding a city named Zaru in the Democratic Republic of the Congo. According to the documentation, "zaru" refers to a type of flat or shallow basket typically constructed from bamboo and used in Japanese cuisine for preparation and presentation.
Variations of these baskets can also be manufactured from materials such as plastic or metal, serving functions similar to those of a strainer, sieve, or colander. There is no information available in the source material regarding any geographical locations associated with this name.