Kaaththottikkaai, is especially cooked on Aadi Amavaasai. Kaaththottikkaai tastes sour. It's a sacred day, which falls during the Tamil month of Aadi. The day is observed with carrying out various rituals and prayers to our forefathers. Keerimalai in Jaffna is famous to fulfill the vows and carry out the rituals. Likewise in the East Maamaanga Pilliayar temple is famous for Aadi Ammavaasai. Devotees go to the ocean to take a bath, purify themselves before the take part in religious rituals.
Kaaththottikkaai is sold Rs.1,000/= per kilogram in Jaffna market due to high demand.
Saiva priests, who performs rituals during a Hindu funeral, do the same rituals on Aadi Amavaasai day. The relatives of the demise take part in the rituals, while offering vegatbles and rice to the priest. The devotees also observe a fast and have a vegetarian meals for the day