Batter : Mix semolina and curd in a mixing bowl. Add water and mix well. Keep aside for 15 minutes.
Filling : Heat oil in a karahi and put cumin seeds and when cumin seeds splutter put finely chopped onions, grated ginger, green chilli and fry till golden. Add peas and cook for 5 minutes or till done. Add mashed potatoes and salt, red chilli powder, turmeric powder, garam masala and chaat masala.
Mix thoroughly and cook for 2 minutes. Switch off the flame.
Divide this filling in two portions. Now make two rolls with this mixture
Now in semolina mixture add salt, baking powder and eno. Pour 1 tb sp water on eno and mix well.
Grease 2 glasses. Put one tb sp mixture in each glass. Fix potato roll in it.
Pour semolina batter over it. Fill 3/4 th glass.
Now heat 1 glass water in a pressure cooker. Put a plate in cooker and keep both glasses on the plate. Place the lid without weight and steam for 12 minutes on medium flame. Switch off the flame.
Open the lid after 20 minutes. Remove both glasses from cooker.Allow it to cool. With the help of knife remove the idli from glass.
Tadka :Now heat oil in a karahi and put mustard seeds and when mustard seeds splutter add turmeric powder and 3-4 tb sp water and put idli roll over it and stir fry on low flame for 2 minutes by rotating it on griddle. Likewise do the same procedure for other one.
Cut it in pieces and serve hot with sauce or chutney.
