Once cooled, add in the corn flour, mashed sweet potatoes, coriander leaves and green chilies. Check the salt levels and combine all the ingredients well. Make small lemon sized balls and keep aside.
Divide the sweet potato mixture into 8–10 balls, then flatten each one. Add 4–5 röstis to the pan and fry for 5–6 minutes on each side until crisp, browned and cooked through. Drain on ...