In a large bowl, add dried sangri and dried ker. Add water, wash the ker and sangri thoroughly to get rid of dirt, if any.
Soak the washed ker and sangri in sufficient water for 7 to 8 hours allowing them to rehydrate.
After 8 hours, drain the water and keep soaked ker and sangri aside.
Soak dry red chillies in water for 15 minutes. Blend soaked chillies and garlic into a coarse paste. Set this aside.
Peel and chop the onions into thin slices. Set this aside.
Heat 2 tbsp oil in a pan.
Add cumin seeds and asafoetida.
Add chopped onions and sauté until they are soft and golden.
Add the chili-garlic paste and rinse the mixer jar with a bit of water to add to the pan. Add turmeric powder. Mix well and cook for a few minutes.
Now, add the soaked Ker and Sangri to the pan.
Mix everything thoroughly, then add coriander powder, amchur powder and salt .Stir well, cover, and let it cook for 8-10 minutes.
Garnish with chopped coriander leaves and serve hot with chapatis, puris or bajra rotis.