Karadaiyan nombu is one of the Thamizh festivals I have seen as I grew up. I can never forget the yellow thread with a flower tied to it, that we tie around neck/ hand. Every day I apply turmeric to keep it yellow every day. Adai is secondary for me those days, but this yellow thread excited me a lot, don't know why. The adai is very flavourful as we roast and add karamani( black eyed peas). My mom adds nava dhanyam in this just for name sake, but its optional. so add it one each, while roasting karamani(Rice by itself make a grain(nell)). I usually sandwich both sweet adai and savoury adai during my childhood, as I am not big fan of jaggery those days. Now I like both. My MIL have no practise to do this nombu, but I wanted to record here, so made it. After long time the flavour of this adai took me back to the childhood days .
The festival is celebrated when the Tamil month Panguni begins and precisely at the time when month starts. But can also be made at the nalla neram of that day. So make it as per your convenience.