Boil 2 cups of water and add spinch, onions and green chillis. Let it cook for 7-8 minutes. Cool and make a paste of it.
Heat oil in a cooking vessel, add cumin seeds and let them splutter.
Now add the garlic and curry leaves and fry for few secs till the garlic loses its rawness.
Now add the boiled spinach paste, chilli pwd, cumin pwd, coriander pwd and salt. Mix well.
Let this cook well till oil separates. Keep stirring once in a while during the cooking process.
Now add the boiled cubed potatoes and mix well. Add one cup water and cover and cook till you get the desired gravy consistency. Adjust salt.
Add garam masala and garnish with fresh coriander leaves.