To begin making Potato Sagu Recipe for Rava Idli, get prepped up with all the ingredients. In a kadai, heat some oil and add mustard seeds and let the seeds splutter.
Once they splutter, add chana dal and urad dal and let it change slightly brown in colour.
Now add curry leaves, a pinch of asafoetida, green chilies, and grated ginger and sauté it for a few seconds.
Now add onions, turmeric powder and a pinch of salt and cook until the onions are cooked but not browned.
Once done add the mashed potatoes, remaining asafoetida and turmeric powder, coriander powder, chili powder, salt and sugar and stir well until combined.
Add a cup of water and cook until you see a gravy consistency, continue to cook for 5-6 minutes on a low flame so that the potatoes absorb all the flavor. Adjust water and combine.
Finally, Add chopped coriander and lemon juice.