Basically, when using the fermented Indian Head cornmeal dough, just bring a couple of cups of water to a boil in a saucepan (about a 3-quart saucepan, with a handle), add a teaspoon of salt, and gradually stir in the fermented dough. If you stirred the dough every day it should not have mold on it, but if there is any, scrap it off before adding the dough to the boiling water. Incidentally, the more days you let the dough ferment, the more sour it will be. If it's your first time, probably 2 days will be long enough.
Has anyone tried making banku in the microwave? Please let me know if you have, and how it worked out. The same basic procedure is used when making banku from already-prepared frozen dough, after defrosting it. If using the powder, one must of course add more water (I would add some water to make the dough, then bring more water to a boil and continue as with the Indian Head fermented dough).
Gosh, just remembering this is making me hungry again.