Heat a kadai or a nonstick pan with ghee.
Add cumin seeds, fennel seeds, red chilies, and hing.
To prevent the spices from getting burnt, add a teaspoon of water right away.
Next add chili powder, turmeric powder, and coriander powder.
Mix well and add the tomato puree and sauté till the ghee separates.
This takes about 5 minutes, once you see the tomato cooked well, add the crumbled potatoes.
When it starts cooking, add salt and mix well.
Add 1/2 cup water and bring to a boil.
Simmer and add beaten curds, mix well and switch off the flame.