Idli upma, i.e, upma made with crumbled leftover idlis are quite common in most South Indian households.  It's very easy to prepare and equally tasty.. Crumbled leftover Idlis - 1 cup
Chopped green chili - 1 tsp
Chopped ginger - 1 tsp
Chana dal (Split Bengal gram) - 1/2 tsp
Urad dal (Split Black gram) - 1 tsp
Mustard seeds - 1/2 tsp
Chopped onion - 2 tbsp (optional )
Sesame oil - 2 tsps

1. Heat oil in a pan. Add mustard seeds and let crackle.

2. Add chopped green chili, ginger and curry leaves. Fry for 2 minutes. Add the urad and chana dal and fry till golden brown.

3. Now add the chopped onions and fry till translucent and golden brown.

4. Now add the crumbled idli and quickly mix with the onion mixture. If you feel the upma is a bit dry, add a teaspoonful of oil more and cook on a low flame for 4 to 5 minutes more. Check for salt and add only a little bit as the idli would have some salt and sourness in it already.

5. Remove and serve hot.
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