Heat oil in a wok and fry the potato cubes till golden. Drain on paper towel and set aside.
Remove oil from wok and leave around 3 tablespoon of oil. Add asefetida and cumin seeds. Sauté for a minute. Add ginger and garlic and stir for 2 minutes.
Add all spices and salt followed by chopped tomatoes and chillies. Mix well and cook for 2 minutes.
Add chopped beans and cook for 7-10 minutes on low heat with frequent stirring. Do not add any water.
Add fried potatoes and mix well. Cook for 2 minutes more.
Remove from heat and serve hot with Chapati.
Notes
Potatoes can also be added to the beans without frying and can be cooked till tender.
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