Flour an overturned 12-by-17-inch cookie sheet and roll out the dough on top of it, using as much flour as needed to prevent sticking, until the dough covers the sheet from edge to edge. Do your best to get them as thin as possible, because the thicker parts become quite hard when baked. Using a spray bottle filled with water, spray the dough to give it a glossy finish. Prick the dough all over with a fork. If you choose, sprinkle with sea salt or seeds. For neat crackers, score the dough into grids.
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