01 - Roast or steam the Korean sweet potato until completely tender throughout. Allow to cool, remove peel, and cut into manageable chunks for blending.
02 - Combine sweet potato chunks, milk, sweetener if using, and vanilla extract in a blender. Process until completely smooth and creamy, ensuring no lumps remain.
03 - Transfer blended mixture to a saucepan. Warm over medium-low heat, stirring frequently, until steaming hot. Avoid boiling to prevent separation. Heat until desired temperature is reached.
04 - Pour hot latte into serving mugs. Dust with ground cinnamon or nutmeg if desired. Serve immediately while hot for optimal flavor and texture.