Wash and soak urad dal for 8 hours.
Combine Sabudana (Sago) and Poha (beaten Rice). Wash and soak them for 8 hours.
Combine fenugreek seeds and rice. Wash and soak for 8 hours.
After 8 hours, grind them separately to a fine paste. Then, transfer each batter to a mixing bowl and mix them thoroughly.
Cover the batter and leave it for overnight fermentation in a warm place.
When the batter gets well fermented, add salt and mix well.
For making dosas, heat a pan and grease it with oil or ghee.
On medium heat, pour a ladle full of batter. Don't spread it much. The dosa has to be thick.
Drizzle some oil along the edge and on the surface of the dosa.
Cover with a lid and cook on low to medium heat till the dosa is fully cooked.
Remove and serve with Chutney/ Sambar/ Sagu.
Note: If you wish you cook the dosas fast, you can flip them once.