While the sweet potatoes roast, combine the black rice, coconut milk, 1 ¼ cups water, and ½ tsp sea salt in a saucepan. Bring to a boil, stir once, then reduce heat and simmer for about 25–30 minutes, or until the liquid is absorbed.
1 1/2 cups black rice, 1 (13.5 oz) can coconut milk, full fat or light, 1 1/4 cup water, 1 tsp sea salt