Bring rice and water to boil in a pan. Simmer, covered, until all the water is absorbed and rice is tender, 20 or so minutes. Add raisins, cashews and cardamom. Dissolve sugar in the coconut milk and stir into the rice mixture gently, so as to not break the ricekernels. Raise heat slightly and cook uncovered until the mixture thickens, 5 to 10 minutes. Remove from heat. Let cool slightly. Garnish with pistachios and serve.