Grind together with chillies and curry leaves. Add salt and hing. Adjust taste by tasting-a pinch of salt or red chilli powder could still be added.
If the whole quantity of batter is to be used, the chopped onions and any other vegetable can be added. otherwise the unused portion can be refrigerated for later use, before adding vegetables.
Heat a thick iron tava /griddle. Temper the tava with a few drops of any veg. oil and a teaspoon of batter initially. Turn over when cooked. remove and discard.
Wipe tava clean with edge of wooden spoon.
On medium heat ladle about 4 tbsp. batter and spread evenly with underside of ladle into a 6-7 " circle.
Put in about 1tsp. oil around the sides. with a flat spatula ease off the edges and carefully turn over.
When both sides are red -brown serve hot with a bit of butter/pickle/curds or syrup.