I tried this dish many times from various sites that almost turned out into bad results. Finally when i was talking to my friend in phone recently got the recipe...It came out good .
Rava - 3/4 cup
Vermicelli(semiya) - 1cup
Carrot - few bits(optional)
Peas - 10 (optional)
Yoghurt - 2cup ( if you wish,you can use 1&half cup curd,1/2 water)
Baking soda - a pinch(optional)
Cashew - 5-6(break into two bits)
ginger -few bits
Green chilly -1 big
Peppercorns - 5-6
First season the things given in seasoning list and add chopped carrot and peas.(tip:Use more oil)
Fry the whole things, then add Rava and then lastly Vermicelli.
When you feel the aroma, off the stove, once it get cool mix all the ingredients with yoghurt.
Mix nicely now add a pinch of baking soda,cashew,salt.
Pour in the Idly mould and stream it,Serve hot with any chutney.
Rava idly is good to have while it is hot,adding vegetable will increase our interest on the recipe than having plain one.