Cut them into 1 inch pieces. Also chop a onion and few green chillis. Heat oil in a kadai and add onions and green chillis. When they are done add turmeric powder, chilli powder, dhanya powder and salt. Mix well and now add the beans. Cover the kadai and let it cook for 10-15 minutes with occasional stirring, until it is done. Switch off the burner and add chopped coriander leaves.