Azadirachta indica, commonly known as neem, margosa, nimtree or Indian lilac, is a tree in the mahogany family Meliaceae. It is one of two species in the genus Azadirachta. It is native to the Indian subcontinent and to parts of Southeast Asia, but is naturalized and grown around the world in tropical and subtropical areas. Its fruits and seeds are the source of neem oil. Nim is a Hindustani noun derived from Sanskrit nimba (निंब).

Rasam is a spicy South Indian soup-like dish. It is usually served as a side dish with rice. In a traditional South Indian meal, it is part of a course that includes sambar rice. Rasam has a distinct taste in comparison to sambar due to its own seasoning ingredients and is fluid in consistency. Chilled prepared versions are marketed commercially as well as rasam paste in bottles.