01 - Roast or steam the Korean sweet potato until completely tender throughout. Allow to cool until safe to handle, then remove the skin and cut into large chunks.
02 - Combine the sweet potato chunks, milk, honey or maple syrup (if using), and vanilla extract in a blender. Process on high speed until completely smooth and creamy, with no remaining lumps.
03 - Pour the blended mixture into a saucepan and place over medium-low heat. Warm gently, stirring occasionally, until the latte reaches steaming temperature. Avoid bringing to a boil to prevent separation.
04 - Pour the hot latte into heat-resistant mugs. Dust the surface with ground cinnamon or nutmeg if desired. Serve immediately while hot.