Sesame

 In our Shastras it is said that, on this Uttarayana Parvakaala day 

https://www.google.com/search?q=Uttarayana+Parva+Kala

one should use Tila (Sesame) seeds in six ways that is: 

Sanskrit – English

1. Tila Snana – Bath using Sesame seeds
2. Tila Deepa – Light the lamp using Sesame seeds
3. Tila Homa – Doing homa using Sesame seeds
4. Tila Tarpana – Doing Tarpana using Sesame seeds
5. Tila Daana – Donating Sesame seeds
6. Tila Bhakshana – Consuming Sesame seeds

https://www.google.com/search?q=Sesame