Combine the lukewarm water, yeast and sugar and set aside to let the yeast foam.
In a large bowl or stand mixer, whisk together the flour, cocoa powder and salt.
Once the yeast has lightly foamed, pour it into the dry ingredients along with the oil.
Stir everything together until a rough dough forms then tip it out onto a lightly floured surface and knead, about 5 minutes, just until it forms a nice smooth ball and isn’t too sticky anymore. Or knead a few minutes in the stand mixer until it pulls away from the sides.
Place the dough in a lightly oiled bowl, cover it with a damp tea towel and place it in a warm place to proof for an hour or until doubled in size.