Peel, wash and cut the potato lengthwise. (similar to the finger chips)wash again properly.
Heat oil in a pan/wok, add cumin seeds and let it splutter.
Once it starts spluttering add the broken red chili and saute until brown. Add potato.
Now add turmeric and salt. Mix well.
Cover and cook on a slow flame until the potatoes are half cooked, stirring in between.
Remove the cover and fry potatoes until it gets cooked well and also it becomes a little crispy.
Now turn off the flame.
Serve hot along with puri, kachori, roti, paratha or plain rice and dal.
Notes
While cutting potatoes, keep them in water, else they will turn blackish.Usage of mustard oil given an authentic bihari touch to the recipe, but if you want you can use any vegetable oil as well.Instead of dry red chili you can use green chili as well.