* Clean and cut beans into 1 inch pieces, and potatoes into cubes * Grind masala finely.
* In a vessel put beans, water, salt and keep on the gas to boil it.
* When beans are half cooked, wash and add potato cubes and dhal and add enough water to it.
* When everything is cooked sufficiently, add ground masala to it, mix well and bring it to boil.
* Season this mixture with oil. (Heat oil in a separate pan, add mustard seeds, garlic and curry leaves. and pour that oil mixture to the beans curry. )
* Serve hot with rice, chapati etc.