1 cup / 6.5 oz / 185 g white urid or urad daal, picked over and rinsed

6 cups / 1.5 liters water, plus more if necessary
1/2 pound spinach, washed and finely chopped
1 tablespoon ginger, peeled and finely chopped
1/2 teaspoon turmeric
2 medium green chile peppers, minced
2 tomatoes, chopped
1/2 teaspoon salt

2 tablespoons butter
1/2 teaspoon cumin seeds
1 teaspoon pure red chile powder
a pinch of asafetida, optional
more salt to taste
juice of 1/2 a lemon
1/4 cup cilantro, chopped