01 - Roast or steam the Korean sweet potato until completely tender. Allow to cool, remove skin, and cut into chunks.
02 - Combine the sweet potato chunks, milk, honey or maple syrup if using, and vanilla extract in a blender. Process until completely smooth and creamy.
03 - Transfer the blended mixture to a saucepan. Warm over medium-low heat, stirring occasionally, until steaming hot. Avoid bringing to a boil.
04 - Pour the hot latte into mugs. Dust with ground cinnamon or nutmeg if desired. Serve immediately.