If using fresh lotus stem than peel, wash and dice the stem. Boil the stems until soft and tender. If using frozen than thaw the stems.
Wash sprouted kala chana. Follow link above to make homemade sprouts.
Assemble: rest of the ingredients.
In a food processor or mixer toss all the ingredients (except potato and oil).
Pulse the ingredients couple of times until it looks like a mixture.
Add mashed potato and adjust seasonings. If the dough feels sticky add 1 tablespoon of besan and mix it well.
Shape it like cutlets.
Heat oil in a pan and ...
Cook the kebabs until crispy and evenly brown.
Serve them hot with the chutney of your choice.
A make ahead appetizer, shape and store in refrigerator. When ready to eat, cook and serve warm.