Wash cholam and dal well. Add fenugreek to the urad dal and soak them separately for 4 to 5 hours.
Now take dal and fenugreek mix in a blender and add water little by little and make it into a smooth fluffy puree. Take this in a bowl.
Now add the jowar to the same blender and puree again till smooth. It wont get smooth, but try to get as smooth as possible. Dont add too much water, add little by little.
Now pour this in to the dal mix and add salt. Mix well and let it ferment for 8 hours or overnight.
Now make seasoning, heat oil in a pan, add mustard, urad dal, chillies, curry leaves and asafoetida. Add in onions and salt and saute for a min.
Now add this in to the batter and mix well.
Heat a pan, spoon this mix into the pan and make like a thick uthappam..drizzle oil over it, and cook till golden on the bottom. Flip over and cook for few more mins.