piki bread is a hopi ceremonial wafer made from a fine batter of nixtamalized blue cornmeal and cooked on a lightly oiled sandstone griddle. there is much to explore in the process. for one thing, the wafers, despite being both lean and ultrathin, are flexible enough to be folded and rolled into various shapes. for another, the nixtamalization is done on fine-ground cornmeal instead of whole kernels. this video of the process is instructive.