Cut potato in thin slices. Stack few of them together. Chop them thin like matchsticks. Add chilli powder, salt and amchur powder to it, mix it well and keep it aside.
In a mixing bowl take besan, add crushed carom seeds, turmeric powder, some salt, rice flour and baking soda. Mix everything well.
Now add little water at a time and make smooth batter. Add green chilli and coriander leaves and mix the batter again.
Now add marinated potato sticks in batter and mix well and keep it aside. Heat the oil at medium high heat in karahi or wok.
Once oil is hot enough drop small size potato mixture in oil with spoon. Once pakoras are cooked for a while turn them over.
Turn them couple of times till pakoras are golden brown and crisp. Take them out on a papper towel . Serve these crisp pakoras with spicy green chutney and ketchup