Rinse the split black gram lentils with enough water and soak for at least 2 hours. After soaking the lentils would be doubled in volume. Next drain all water and transfer to mixer. Include 3 table spoons of water and grind finely.
The batter should be fluffy and thick. So add water carefully. Take the batter in a wide bowl and add salt, medium rava, chopped coconut, ginger, chillies, curry leaves and coriander leaves. Mix everything together.
Meanwhile heat oil in a wok in medium flame. Next, with damp fingers take a big lemon sized batter and make a hole at the center using thumb. Carefully drop the vada in to hot oil. Deep fry till golden brown. Continue the process till you empty the batter.
To prepare sambar, take chopped drumstick and shallots in a cooking vessel. Add some water, turmeric powder and salt. Let it cook in medium flame till soft.
Heat pan adding oil, cinnamon, sliced onion and grated coconut. Roast them together till onion turns translucent. Transfer them to mixer and add sambar powder to it.
Grind all the ingredients to fine paste along with little water. The veggies would have turned soft in 10 minutes.
Include tamarind water, jaggery to the veggies and let it cook for 3 minutes.. Next add ground masala to the same.
Add cooked toor dal and water to adjust consistency. Bring it to boil and add coriander leaves. You can adjust salt also at this stage. Finally temper with mustard seeds, lentils and curry leaves.
Amazingly delicious sambar vada is ready to serve as breakfast or snack.