Rinse the raw rice, lentils and rice flakes separately with enough water. Soak them separately for 2 to 3 hours. Rice flakes can be soaked for just 20 minutes.
Drain all the water from lentils and transfer to mixer. Grind it to fine and fluffy batter adding water as needed. Transfer the batter to bowl.
Next add soaked rice to the same mixer and grind finely include water as necessary. Transfer this batter to the same bowl.
Finally, add soaked rice flakes and grind finely. Mix this with other batter and let it ferment for 8-10 hours.
After the fermentation, the batter would have raised in volume. Now add salt and mix.
For topping, take all veggies onion, carrot, tomato and coriander leaves in a bowl. Mix them with little salt. Next, heat tawa smearing some oil. Pour a ladle ful of batter at the center.
Spread it little thicker and top it with veggies. Press the veggies on top so that they get inside uttappa. Flip and cook the other side after few seconds.
Healthy and filling breakfast uttappa is ready to serve with coconut chutney.