To make the dough we start by activating the yeast. Take a bowl and add the warm water and sugar and add the pack of yeast. Now let this bloom for about 5 to 10 minutes in a warm place.
Once the yeast has bloomed add the oil, mashed sweet potato, backing powder and flour to the bowl and mix until you get a soft and dough. I let the food processor mix the dough for about 15 minutes or so. You can also kneed it by hand. During this process you can add turmeric to enhance the colour.
Now add the ball of dough to a bowl, cover it and set it somewhere warm to let it rise for about 60 minutes.
Once the dough has doubled in size take kneed the dough a little and separate the dough into little balls.
Using a rolling pin flatten them out until about 1/4 of an inch and add a small table spoon of the filling in the middle.
Now pinch to close the tops and roll it into a little ball.
Add a piece of parchment paper in your steamer and place the buns on top. I used a large steamer so i steamed about 5 buns at the time, keep in mind that they grow inside the steamer.
Steam the buns for about 15 minutes and they are ready to be served.