Wash the idli rice and urad dal separately under running water.
Soak them in enough water separately for at least 4-6 hours or overnight.
Grinding:
Drain the water from soaked urad dal and grind it to a smooth and fluffy batter using a wet grinder or a high-power blender. Add water gradually as needed.
Similarly, grind the soaked rice to a slightly coarse batter. The texture should be finer than semolina (sooji).
Mix both the batters together in a large bowl. Add salt to taste and mix well.
Cover and let the batter ferment in a warm place for about 8-10 hours or until it doubles in volume.
Steaming:
Grease the idli moulds with a little oil.
Pour the batter into each mould, filling them 3/4th full.
Steam the idlis in an idli steamer or any steamer for about 10-12 minutes on medium heat.
Once done, let them cool for a few minutes, then remove them from the moulds using a spoon.
For Sambhar:
Cooking Dal:
Wash the toor dal and pressure cook it with enough water until soft and mushy. Mash the cooked dal well and set it aside.
Preparing Tamarind Extract:
Soak the tamarind in warm water for 10-15 minutes. Squeeze it to extract the pulp. Discard the solids and keep the tamarind water aside.
Cooking Vegetables:
Heat oil in a pan. Add mustard seeds and let them splutter.
Add cumin seeds, asafoetida, dry red chilies, and curry leaves. Sauté for a few seconds.
Add chopped onions and green chilies. Sauté until onions turn translucent.
Add chopped tomatoes and cook until they turn mushy.
Add turmeric powder and sambhar powder. Mix well.
Now add all the chopped vegetables (carrot, potato, okra, green peas) along with salt. Sauté for 2-3 minutes.
Making Sambhar:
Add the cooked and mashed toor dal to the vegetables.
Pour in the tamarind extract and mix well.
Adjust the consistency by adding water if needed.
Let the sambhar simmer on low heat for about 15-20 minutes until all the flavors blend well and the vegetables are cooked through.
Serving:
Serve the steaming hot idlis with piping hot sambhar and coconut chutney for a delicious South Indian breakfast or brunch. Enjoy!