Amavasai (अमावस्या) means New Moon night in Sanskrit language when there is no moon at night. Amavasya (अमावस्या) is observed as a pious day . In old Indian culture and beliefs, irrespective of religions, it is considered a time of great power. In Tamil culture, though, Amavasai is commonly used in religious spheres.
There is specific Thaligai(cooking) on Amavasya day . On that day recommended vegetables are Bitter gourd, Raw banana, Colocasia (Seppankizhangu),Senai kizhangu, Ladies finger, Snake gourd, avaraikkai, and White Pumpkin. 'English' vegetables are to be avoided-carrot, cabbage, cauliflower, beetroot etc. On Amavasai days, recommended dhal is Moong dhal(Pasi paruppu) . In payasam cashew and raisins, are not recommended. Only Jaggery based payasam is allowed ( No sugar based payasams). Only one main meal is taken and at night Palaharam(Actually fruits but nowadays tiffin items) are taken at night.
But festival amavasaya days like Deepavali day, you can use tuvar dhal, and cashewnuts.
Thanks Veda bahenji for your nice guidance.
I would appreciate if someone could improve on the above.
Amavasai Thaligai Menus: