In a pressure cooker heat the oil and add mustard seeds let them dry nicely
Grind the tomatoes and add the puree fry it for another min add all the dry spices
Let it dry till the oil separates
And add pasta and potatoes in the cooker fry it till the oil separates and the tomatoes nicely coat the pasta and potatoes
Add Water and close the lid let it cook on high flame for 2 whistles
Serve it hot and dress it with fresh coriander leaves