Heat up a pan add in mustard oil.
Add the mustard seeds when the oil is hot and smoking.
Add in the potatoes and fry well.
Add salt, sugar, turmeric powder and green chilies. Mix well
Add all the chopped pumpkin leaves and stem and mix well for 5 minutes.
Add 500 ml of water and cook on medium flame for next 5 minutes.
Cover the pan and cook it for next 12 minutes on low heat.
Cook until the water is dry and leaves are soft.