Boil the cubed potatoes with salt, till it becomes tender. Make sure, it still hold it's shape and doesn't become mushy.
Heat ghee / oil in a wide pan and crackle the jeera seeds. Add chilli, coriander, turmeric, cumin and fennel powder. Fry for a min and add 1-2 tbsp water to bring together the masala.
Add the cooked potatoes and gently mix well, till all the pieces are coated well with the masala. Add 1 tbsp water, if required. Continue to roast on low flame till the potatoes develop a small crust. Drizzle 1-2 tsp of ghee or oil.
Add chopped coriander leaves and gently mix. Serve with rice or roti.