Step 1: Soak the Dal

1. Soak the urad dal in water for 3-4 hours or overnight. This step is crucial for achieving a smooth batter and the correct texture for the vadas.
2. Soak the rice along with the dal if you’re using it for extra crispiness.

Step 2: Grind the Batter

1. After soaking, drain the water from the dal and rice (if used).
2. Grind the dal to a smooth batter using a food processor or wet grinder. Add little water at a time to get a thick, fluffy batter. The consistency should be thick enough to hold its shape when you make a ball with it, but soft enough to spread a little when frying.
3. Whisk the batter: This step is essential for making the vada fluffy. After grinding, use your hand to vigorously whisk the batter for 3-4 minutes until it becomes light and airy. This will help the vada puff up and become crisp when fried.

Step 3: Add Seasonings

1. To the batter, add chopped green chilies, grated ginger, cumin seeds, curry leaves, and finely chopped onions (if using).
2. Add salt to taste and mix everything thoroughly.

Step 4: Heat the Oil

1. Heat enough oil in a deep frying pan or kadhai to submerge the vadas completely. Test the oil by dropping a small amount of batter; if it sizzles and rises to the top, the oil is ready.

Step 5: Shape and Fry the Vadas

1. Wet your hands slightly to prevent the batter from sticking.
2. Take a small portion of the batter (about 1-2 tablespoons), and shape it into a ball. Make a hole in the center with your thumb to form a doughnut-like shape.
3. Carefully drop the shaped vada into the hot oil. Don’t overcrowd the pan; fry only a few at a time.
4. Fry on medium heat until the vadas are golden brown and crispy on all sides, about 3-4 minutes per side. Use a slotted spoon to flip them over gently.
5. Remove the vadas from the oil and place them on a paper towel to drain excess oil.

Step 6: Serve

1. Serve the freshly fried Medu Vadas hot with coconut chutney and sambar for the authentic South Indian experience. You can also enjoy them with tomato chutney or any other dipping sauce of your choice.