01 - Roast or steam the Korean sweet potato until completely tender when pierced with a fork. Allow to cool slightly, then remove skin and cut into 1-inch chunks.
02 - Combine prepared sweet potato, milk, honey or maple syrup if using, and vanilla extract in a blender. Process on high speed until completely smooth and creamy, approximately 1-2 minutes.
03 - Transfer blended mixture to a small saucepan. Heat over medium-low setting, stirring frequently, until steaming hot throughout. Do not allow to boil. Remove from heat when temperature reaches approximately 165°F.
04 - Pour hot latte into pre-warmed mugs. Dust tops with ground cinnamon or nutmeg if desired. Serve immediately while hot.