Wash the potatoes in fresh water and boil them in a pot of water for about 15 minutes until they are about 90% cooked. Do make sure that they are not too soft and hold their shape well.
Once they are cooked, remove from the flame and drain away the water. Keep the potatoes on a kitchen towel lined plate.
Separately in a bowl mix the oil and the podi powder well along with half a teaspoon of salt. Keep aside.
Line a baking sheet with parchment paper and preheat the oven to 400F
Arrange the cooled potatoes on to the baking tray. With the back of a measuring cup or a flat bottom bowl, gently smash the potatoes but not all the way so much so that the shape still holds.
Brush all the potatoes one by one with the oil and spice mix very well on all the sides. We want the potatoes to be very flavorful once they roast.
Coarsely crush and sprinkle the black pepper along with some salt uniformly on all the potatoes.
Bake the potatoes for about 25 to 30 minutes at 400F until you see that they have roasted well.
Remove from the oven and transfer to a serving dish. Squeeze some lime juice and garnish with the coriander leaves. A dash of chat masala here does wonders.
Serve the smashed podi potatoes as such or with a chutney / dip of your choice.