Preheat a large skillet with 3 Tbsp of oil on medium to high heat. Add in the potato pieces and shallow fry the potatoes until they are golden brown (may not be fully cooked). Set aside
Bring the skillet back to heat again. Add in the ginger. Stir fry until fragrant, about 1 minute. Add in the tomatoes, turmeric powder cumin powder, and chili powder. Cook until the tomato started to break down and form a mush. Add in the spinach leaves. It will be a big heap at first, but it will quickly wilted down as you stir and cook. Once the spinach is wilted but still fresh green in color, add in the potatoes. Stir to mix everything and let it cook for another 5 minutes or until the potatoes are soft (but not mushy). Season with salt and pepper to your taste. Dish out and serve immediately as side dish