Cook the potatoes whole in the Instant Pot.Cook in about 2-3 cups of water on Manual / Pressure Cook mode for 6 minutes and wait for pressure to release naturally.You can also cook the potatoes in a regular pressure cooker. Use the same amount of water / enough to almost cover the potatoes. Cook for up to 4-5 pressure whistles.
4 yellow potatoes
Once cooked, put the potatoes in a bowl full of water and ice, to cool down quickly.
Once cooled enough to handle it, peel the potatoes and crumble them with your hands.
While the potatoes are cooking, heat oil in a heavy bottomed pan. Add mustard seeds, curry leaves and chana dal to it.