http://www.partyideasforyou.com/onam-celebration-kerala/
Can somebody from Kerala explain me the celebration of Onam?
Hi my fiance is from Kerala I know there be will be celebration of Onam tomorrow but as a Europea I don’t know much about this and I want to surprise him to prepare something…
thank you are sweet!!!
nice to hear that u want to surprise him on Onam 
here is the recipe for Paysam (a sweet dish from kerala). Its very easy to prepare, and wont take any more than 40-45 mins. He will definitely enjoy it a lot.
Good luck…
A report on Onam celebration by Kerala govt Part 1