If you can find Fermipan, Saf or Red Star Fast Rising yeast, those are the best for this recipe. If not, use Fleischmanns bread machine yeast. Kitchenaid also now has a new 7 quart mixer that makes close to triple batch challah -perfect for the high holidays or anytime you are doing volume bread baking. You can also dump this whole recipe in a bread machine on Dough Cycle or make it by hand. Challah is a most amenable dough.