Prepare a lightly oiled bowl or container to allow the resting of dough.
Sift flour, 25 g deZaan Holland Carbon Black 10/12% Dutched Cocoa Powder and 2/3 of Sugar and Salt into a mixing bowl. Set aside until ready to use.
In a separate bowl, add remaining 1/3 of Sugar, Yeast and 50ml of warmed Water. Stir to activate the Yeast and allow to fully dissolve.
In a separate bowl, add remainder of Water, Oil and Vinegar. Set aside until ready to use.
Once fully dissolved, add the wet Yeast mixture to the Flour mixture in the mixing bowl.
With a dough hook attachment, mix into a rough dough.
At the same time, stream the remaining wet ingredients into the mixing bowl and create a smooth dough. Note: This process will take approx. 10-15 minutes.
Once a smooth dough is achieved, transfer to prepared oiled bowl. Cover with a damp cloth for approx. 1.5-2 hours at room temperature. (TIP: Depending on weather circumstances, dough can also be left to double in size).
Once dough has doubled in size, transfer dough onto a flat clean and floured work surface. Flatten dough out and knead in the Baking Powder.
Proceed to roll dough out and cut off about 50g portions (approx. 17 servings).
Once portions have been weighed, roll cut portions into balls. Transfer to a sheet tray lined with parchment paper. Cover with a damp cloth and let rest for about 3-5 minutes (If weather is leaning to the warmer side, allow them to rest 5-10 minutes in the refrigerator before rolling out again).
At this time, prepare 17-20 rectangular pieces of parchment paper to fit over each individual dough. Set aside until ready to use.
Once the dough has rested, roll each ball out into a flat circle with a rolling pin. Roll to about 4mm thickness. Transfer to prepared parchment paper (rectangular cut pieces prepared in step 12).
Oil the inside of the bun using a brush and gently fold into a half moon shape, folding the top edge to meet with the bottom edge.
Once step 14 has been repeated with all the buns, transfer all buns onto a sheet tray and cover with a towel. Allow to rest for approx. 1-1.5 hours (or double in size).
Prepare a steamer over bain-marie running on medium-high heat. Note: This step needs to be started once the dough is almost ready.
Steam buns for about 7-8 minutes.
TIP: Buns can be pre-steamed ahead of time and rewarmed (by steaming for a maximum of 2 minutes).