Saute 2 tablespoons minced ginger in a saucepan with butter. Add 1 cup rinsed basmati rice, 1 cup coconut milk, 1 cup water and a pinch of salt. Bring to a boil, then reduce heat; cover and simmer until the liquid is absorbed, 15 minutes. Let stand 10 minutes off the heat; fluff with a fork. Garnish with cilantro and cashews.