Peel the sweet potatoes and cut them into slices. Parboil the potatoes. Once it is done keep aside
In a bowl. Combine sweet potato, red chilli powder, salt, garam masala, chopped coriander leaves, and little oil. Mix well. Keep aside

In a bowl. Combine sweet potato, red chilli powder, salt, garam masala, chopped coriander leaves, and little oil. Mix well. Keep aside.

In another bowl. Combine gram flour, rice flour, baking powder, salt, carom seeds, onion seeds and little oil. Mix properly.
Add sufficient water and make a thick batter. Once it is done. Keep aside.

Heat oil in kadhai. Once the oil is hot. Dip the sweet potato slices. Shallow fry the sweet potato slices. Till it become golden brown in all the sides. Once it is done. Transfer to a plate. Drain the excess oil in kitchen paper. Once it is done.