Take a bowl. Add maida, salt and chilli powder. add some water and make it as a paste. Now add the cubed idli pieces and coat nicely. Heat oil in a kadai and when it is hot add the idli pieces one by one and fry in 1 batch. Keep it seperately. Now take a pan. Add 2 tblspn oil. When it is hot add cumin seeds. Add onion, salt and cook until slightly brown. Add ginger garlic paste, corriander leaves and cook until the raw smell goes of. Now add the chopped tomato and cook on low flame until soft. Now add tumeric, corriander,cumin and chilli powder and cook until the mixture leaves oil. Now add the tomato puree, peas, adjust salt and add 1 cup water and cook again until the mixture leaves oil and becomes as a thick gravy like sauce. Now add the fried idlis to the prepared sauce and mix well. Serve hot with raitha.