So here is the link for Ridge gourd gravy (Peerkangai chutney as we call).
Other vegetables that can be made as gravy in this same way are :
1) Yellow pumpkin - Recipe here.
2) Potato - peel off the skin and follow the same method.
And I think this carrot beans stir fry (poriyal) is very simple to make, I have not posted the recipe, but will post it one day on next week.
Mean while, you can browse the Dry curry recipes if you are interested. But I promise I will post this carrot beans poriyal recipe soon :)