In a medium pot, add the diced potatoes and cover them generously with water. Over a high flame, cook the potatoes until they are fork-tender. This should take approximately 10-12 minutes. Check the doneness by piercing a potato cube with a fork; it should easily slide through. Once cooked, drain the potatoes in a colander or wire mesh strainer and set them aside.
Meanwhile, in a separate pan, heat olive oil over medium heat. After one minute when the oil is hot, add cumin seeds and let them sizzle for a few seconds until fragrant.
Stir in minced green chili and grated fresh ginger, sautéing for about one minute to release their flavors.
Add the washed chopped spinach (including the stems) to the pan. Stir well to coat the spinach with the spices and cook for a few minutes until it wilts down.
Pour in 1 cup of water to help cook the spinach. Cover the pan and let the spinach simmer for about 6 minutes, or until it is tender.
Once the spinach is cooked, allow it to cool slightly. Transfer the contents of the pan to a blender or food processor and puree until smooth. You may need to do this in batches, depending on the size of your blender or food processor. You can alternatively place the contents of the pan into a container and puree them using an immersion blender.
In the same pan used for cooking the spinach, heat olive oil over medium heat. Add the asafetida, ground turmeric, Kashmiri red chili powder, coriander powder, and garam masala. Stir well to combine the spices and cook for about 30 seconds until aromatic.
Pour the pureed spinach back into the pan with the spices. Stir everything together to ensure the spices are well incorporated into the spinach.
Add the cooked potatoes to the spinach mixture. Gently stir to coat the potatoes with the spinach and spices. If the mixture appears too thick, you can add a splash of water to adjust the consistency. If it is too thin for your liking, continue to cook for a few minutes to evaporate off some of the liquid.
Season the dish with salt according to taste.
Transfer the contents of the pan into an attractive serving dish and optionally garnish with cilantro and mint leaves.