Roast the lotus roots over a coal fire for about 5 minutes, or until large brown specks appear allover, then allow to cool slightly.
Alternatively, preheat the grill (broiler) to medium and grill (broil) the lotus roots.
When the lotus roots are cool enough to handle, peel the skin, then chop the roots into thin slices.
Transfer to a blender or food processor and process to make a coarse paste.
Put the paste in a bowl and add the chopped coriander, chillies and spices and mix well.
Season with salt, add the breadcrumbs and mix well again.
With damp hands, divide the mixture into 25 small balls, then flatten each ball into a round patty.
Heat enough oil for shallow-frying in a kadhai or deep frying pan (skillet) over medium-high heat.
Working in batches, add the patties to the hot oil and shallow-fry for about 3-4 minutes, or until light brown.
Remove with a slotted spoon and drain on kitchen paper (paper towels).