Amavasya Tarpanam is a ritual performed to offer homage to one's ancestors. It is a significant part of various South Indian traditions, including those followed by Iyers, who are a subsect of Tamil Brahmins. While the core concept of Tarpanam remains the same across different Brahmin communities, there can be variations in the specifics of the ritual and the ingredients used, including for Smarthas. 

Buy the Amavasya Tarpanam set for Smarthas from GiriUK. The set consists of ample quantities of Darbhai, Pavitram, and Koorcham - all Kusha grass made for Iyers!