Peel the sweet potatoes, cut into 1 cm chunks, and soak in water for 10 minutes.
Sift the flour and baking powder. Add the sugar and mix together.
Add the milk to Step 2 and mix with a rubber spatula. Add the sweet potatoes and mix again. Line your steamer with kitchen parchment paper or a damp kitchen towel that has been thoroughly wrung out.
Use a spoon to scoop the batter from Step 3 into the heated steamer (it'll be hot, so remove the top tray and add the dough).
Steam for 15 minutes over high heat.
Once steamed, place them on a colander, sieve, or similar, and fan with a handheld fan while they're still hot.
Story Behind this Recipe
This is a sweet variation of a recipe my friend taught me.
Adjust the amount of sugar according to the sweetness of your sweet potatoes. When scooping out and portioning the dough, aim for 4-5 cm pieces.