¼ tsp. grated nutmeg
1 tsp. kosher salt
1 tsp. ground cinnamon
1 tbsp. minced ginger
4 tbsp. (1/2 stick) unsalted butter
½ cup water
½ cup packed brown sugar
1 orange, zested and juiced
2.5 to 3 pounds sweet potatoes (about 5 medium potatoes), peeled and cut into bite-size pieces