We were pleasantly surprised to find 'Ash Pumpkin' being sold at our Indian store and the thought of having fresh 'vadiyalu' made us happy :) Soon there was a phone call home (MIL) and I learn one more recipe !
The Ingredients:

Firstly, I cut the gummadikai , salted it and hung the pieces in a cheesecloth overnight. (Like for paneer). Also soaked urad dal separately. The next day into the blender go soaked urad dal,green chilli, hing and salt. After it gets to the consistency of idli batter I transfer it into a bowl, mix the drained gummadikai pieces.

Both of us like to eat the batter mixed with hot rice and ghee. So kept some aside and the made the rest into vadiyams. :) I'll fry these in the evening for dinner.

To Note :
1. Wash the pumpkin thoroughly, esp the skin.
2. Deseed the pumpkin.
3. Little urad dal goes a long way, since the batter is fluffy.
4. The batter made into lumps and spread on a wet cloth.
5. Fry the vadiyams in oil the same day .