Cook the potatoes in a large, heavy-based pan of salted boiling water for about 12 minutes, or until cooked but not mushy. Drain and set aside.
Heat the ghee in a large, heavy-based pan over medium heat, add the asafoetida, and stir-fry for about 30 seconds, or until it puffs up. Add the cumin seeds and stir-fry for 1 minute, or until they start to splutter. Add the ginger and chillies and stir-fry for about 30 seconds, then add the potatoes and stir-fry for 1 minute.
Add the ground pomegranate seeds, chilli powder, and turmeric and stir-fry for a further 1-2 minutes, or until the masala turns dark brown and evenly coats the potatoes. Remove from the heat and adjust the seasoning, if necessary.