Preparing the batter:

• Soak the Urad Dal for 2-3 hours in water.
• In food processor or blender, grind the urad dal with less water. E.g. adding nearly half a cup of water to the 1 cup of soaked urad dal.
• Never grind the batter for long time at once, grind few seconds – stop, grind again. Open the lid and add water little by little when needed.
• Never add salt to the batter while grinding, it will make the batter watery and hard to shape the vadais.

Making Vadai:

• Chop onions, coriander leaves and green peppers (optional). Add all these and the black pepper to the batter along with salt.
• Now mix everything well and keep it aside.
• Heat enough oil in a pan (be generous or else vadais may stick to the bottom and get burnt).
• Now wet your right hand well and make a small ball.
• And use your thumb to make hole in the middle.
• And drop it in oil (just invert the vadais over the oil and slightly shake your fingers)
• Fry them in medium flame, turn the vadais and fry till both the sides turn crisp and golden brown.