Thaw the spinach, drain and squeeze out as much water as possible
Peel and cut the potatoes into three-centimetre cubes and boil them almost soft in water with 1/2 teaspoon of salt. Take care on the boiling water.
Heat the oil in a frying pan until it sizzles when you drop a mustard seed.Fry the mustard seeds under the lid for about 10 seconds. Mix in the spinach and fry for a few minutes, stirring, until it turns light brown. Add the potatoes and fry until they get colour.
Pour in 2 tablespoons of the potato water, mix in the coriander and let it cook for a few minutes.
Notes
Garnish with chopped green chilies. Serve as a side dish, preferably with lamb dishes, or as a stand-alone dish with naan or chapati