Cover, lower heat, and simmer two mintes. Turn off the heat and let the pot sit, covered, for an hour. Bring the water to a boil again. Add the rice and the ginger and bring to a simmer. Cover, turn heat to low, and cook gently for one hour. Stir occasionally during this period. Now add the spinach and salt. Bring to a simmer. Cover and cook gently for half hour, stirring now and then to avoid sticking. Add a little hot water if the porridge seems too thick. Heat the ghi in a #5 skillet over a medium flame. When hot, put in the hing. Two seconds later, put in the whole cumin seeds. Five seconds later, put in the onion. Stir and fry until the onion begins to turn brown at the edges. Add the ground cumin, coriander, and cayenne. Stir and fry for one minute. Empty the contents of the skillet into the rice and bean pot. Stir. Cover and cook for five more minutes. Discard the ginger. Sprinkle with pepper. Serve in individual bowls with some or all of the garnishes. Madhur Jaffrey's World-of-the-East Vegetarian Cooking