For preparing mixed vegetable idly, soak urad dal and rice separately. Grind to a fine batter adding salt and leave it to ferment overnight.
Before making idlies, cut the vegetables(cabbage, carrot and beans), sautT in a little oil and add to the batter.
Now cut chillies, coriander leaves, onion, ginger and curry leaves and sautT well adding a pinch of salt(need not sautT coriander leaves). Keep this aside.
Make idlies and arrange them on a hot pack. While the idlies are hot, sprinkle some coriander leaves and onion mixture on to them and serve hot.
Mixed vegetable idly is ready. Serve with tomato chutney or coconut chutney as side-dish.