Heat 2 tbsp mustard oil in a heavy-bottomed pot over medium-high or medium flame. After it starts to smoke, add panch phoran and asafoetida. Cook for a few seconds.
Add the potato pieces and cook them for 2 minutes.
Then add pumpkin and radish. Mix well. Cook them for 1-2 minutes.
Add brinjal and ridge gourd. Give them a mix.
Add the chopped spinach. Mix everything well and cook for another 1-2 minutes.
Add salt, sugar, turmeric powder, coriander powder and red chilli powder. Mix well. Lower the flame to medium or medium-low. Cover with a lid and cook for 10 minutes.
In a small bowl, add mustard powder and water. Mix well.
After 10 minutes, uncover and pour the mustard powder slurry.
Mix well and cook for 3-4 minutes until all the water evaporates. Stir frequently.
Turn the flame off. Pour 1 tbsp mustard oil over the chorchori and mix well.
Serve hot with khichuri, beguni, chutney and payesh.