You can add shredded curry leaves and chopped coconut pieces to the batter.
A spoonful of rice flour can be added in place of suji for a crispy exterior.
The batter should be of the right consistency – when you place a little batter on your palm, it should retain its shape. If the batter is too thick, the inside of the vada will be hard; if the batter is runny, it will not hold its shape and will absorb excess oil.
Keep the batter refrigerated – otherwise the batter will go soft if kept out for too long. Bring to room temperature before making vadas.
You can also use a banana leaf to shape the vadas.