To make idli :-

Wash and soak urad dal and rice separately for 4-5 hours.
Remove excess water from the urad dal and grind it finely using less water, also remove the excess water from the rice and using less water, grind it a little thicker.

Mix both, and prepare a thick batter, keep it in a big bowl and leave it covered for 10-12 hours.
Add baking soda and salt to the fermented mixture. Add little water if mixture is too thick (make it like a spoon falling consistency).

Boil water in idli maker and pour the batter into it on high flame.wait for 15-20 min and your idli is ready.

To make sambhar:Boil 2 cups of water in pressure cooker, add turmeric powder and salt. Add toor dal.Wait for 2-3 whistles on medium flame.
Mash properly cooked dal smooth with the help of spoon.
Mix all vegetables,few Curry leaves,1 cup water,salt and little turmeric powder in the dal. Wait for 1-2 whistles on low flame. Once pressure is removed add sambhar masala, tamrind water and boil for 2-3 minutes. Heat ghee in pan add few Curry leaves and mustard seeds, and give tadka to the sambhar.

To make chutney: follow my link https://cookpad.wasmer.app/in-hi/recipes/12311738-peanut-pudina-dhaniya-chutney?via=search_home_draft_recipes

Serve idlis hot with sambhar and chutney.