Add rice and water to a medium-sized sauce pan with a lid. Cook on high until the broth just starts boiling. Turn down the heat to a low and put the lid on the pan. The broth should be at a simmer. Check the rice every 5 minutes or so to make sure the broth is not boiling but only lightly simmering. Cook for 15 - 20 minutes.
While the rice is cooking, chop the parsley and walnuts. Set aside. When the rice is done add the butter and stir until the butter is melted and incorporated into the rice. Add the parsley and walnuts and mix thoroughly. Enjoy!