Wash 4-5 medium potatoes and boil them until a knife slides in easily — about 12-15 minutes on the stovetop, or 2 whistles in a cooker. Don't push past that point. Overcooked potatoes turn mushy and fall apart the moment they hit the pan. Once they're cool enough to handle, peel and cube them into roughly 1-inch pieces so they keep their shape while simmering.
Heat 2-3 tablespoons of ghee in a kadai on medium heat. Drop in 1 pinch of hind and 1 teaspoon of cumin seeds and let them sizzle for a few seconds until fragrant.
Add 1-2 finely chopped green chilies and 1 teaspoon grated ginger. Sauté for 30 seconds — just long enough to release the aroma. Don't let the ginger brown.
Tip the boiled potato cubes into the tempering and toss gently to coat everything in ghee.
Sprinkle in sendha namak to taste, and a pinch of black pepper if you want mild heat.
Add a splash of water, about ¼ cup, if you prefer a slightly gravy-like curry, or skip it for a drier sabzi. Simmer 4-5 minutes on low, stirring now and then so nothing sticks.
Right before serving, stir in 2 tablespoons of roasted, crushed peanuts or a spoon of fresh curd — whichever you prefer, or both if that's how your family does it. Finish with chopped coriander (if your vrat allows it) and a squeeze of lemon.