Take thou also unto thee wheat, and barley, and beans, and lentiles, and millet, and fitches, and put them in one vessel, and make thee bread thereof, according to the number of the days that thou shalt lie upon thy side, three hundred and ninety days shalt thou eat thereof…And thou shalt eat it as barley cakes, and thou shalt bake it with dung that cometh out of man, in their sight.

Ezekiel 4:9,12

Thanks to Sacred Sandwich