In a pressure cooker, add the potato cubes and cook until the potatoes are cooked through. Should be about 3-4 whistles

In a separate pot, add the mustard and cumin seeds to some oil. When the mustard starts sputtering, add the onions, minced ginger and garlic, the green chillies and sauté. Once the onions go soft, lower the heat to low, and add the masala powders and cook until the raw smell of the masala gone has gone

By this time, your potatoes should be cooked and the pressure in the cooker should have been gone. Add the potatoes to the masala mixture and slowly with a spatula turn the potatoes in with the masala mixture. Try not to mash the potatoes. The fire will be on low this whole time

When it is well coated, add the freshly chopped coriander, and let it rest for a few seconds before you serve

I served this with some home made chappathis