For 10 points, name this type of food which, in Catholicism, constitutes the host that transubstantiates into the body of Christ.
In Eastern Orthodox Christianity, this substance makes up the prosphoron prior to its ritual use. The name of Bethlehem literally means "house of" this substance. During the first of Jesus's three temptations, Satan asks him to turn stones into this substance. In Judaism, the "Hamotzi" blessing is recited over this substance, and egg is used to help make a braided type of this food called challah. For 10 points, name this type of food which, in Catholicism, constitutes the host that transubstantiates into the body of Christ.
In Eastern Orthodox Christianity, this substance makes up the prosphoron prior to its ritual use.
bread [prompt on "food"]