Soak the poppy seeds in warm water for an hour. And a make a coarse paste out of it.
Also wash, peel and cube potatoes roughly into 1 cm cubes. Ensure to soak them in water to avoid oxidation.
In a pan heat mustard oil. Splutter the panch phoran mix. Add the green chillies and sauté it for a 15-20 seconds. Add potatoes and turmeric powder and sauté stirring frequently for about 2 minutes.
Add the poppy seeds paste and saute it again for a minute.
Add water and salt, cover with lid and cook for approx 20 minutes on low flame or till the potatoes are cooked through , well a little overdone. (such that you could easily press and it kind of loses its shape) Keep in mind to check the water content and stir in between occasionally.
The curry is supposed to be dry with the paste sticking on the potatoes . when the potaoes are cooked through , ensure that you boil off extra water.
Add sugar to the curry and cook for 30-40 seconds more mixing it properly.
Taste the curry and serve hot.