YES, DO SKIP THE HUMAN DUNG: Ancient Hebrew recipe you could make today: Ezekiel's bread. But you may want to leave out one ingredient God commanded Ezekiel to use, to remember that exile is foul (Miriam Feinberg Vamosh, Haaretz).
The story in Ezekiel 4 is an acted-out oracle describing how awful the siege of Jerusalem will be: there will be so little grain that people will have to consolidate all they have just to make up a loaf of bread. And the animals will already have been eaten, so there won't be any animal dung to use for a cooking fire. This bread is not meant as a health food.