As barley cakes — Because they never had enough to make a loaf with, they eat them as barley cakes. With dung — There was no wood left, nor yet dung of other creatures. This also was represented in a vision.
Related Commentaries of Ezekiel 4:12
Ezekiel 4:12
12 And thou shalt eat it as barley cakes, and thou shalt bake it with dung that cometh out of man, in their sight.