Odiyal is a hard, edible snack made from the palmyra palm tuber. Generally, it is split into two and dried until it gets hard. Odiyal can be prepared in another form called Pulukodiyal (புழுக்கொடியல்). Pulukodiyal is prepared by boiling and then drying. It is used to produce Pulukodiyal flour.^[1]

Odiyal is a main ingredient for some food products such as Odiyal flour, Odiyal chips, Odiyal pittu, Odiyal kool, Palm posha, etc. It is a popular snack in the Jaffna peninsula.

https://en.wikipedia.org/wiki/Odiyal