It's a refreshing, cold drink somewhat similar to India's yogurt-based raita: like raita, it will bank the fires of a particularly spicy meal and it can be either sweet or savory.
In a blender, place the milk, poi, sugar, bourbon or brandy (or 1/4 teaspoon vanilla), and about 1 cup of crushed ice. Bl;end thoroughly and pour into a glass. Sprinkle the top with nutmeg.