Pebble-Baked Flatbread

Pebble-baking is among the oldest of cooking methods, the laying of grain or dough on heated stones, and early ritual texts describe scattering grain and meat onto hot stones to cook them. The bread itself is documented by the Tang scholar Li Kuangyi (李匡乂) in his 《资暇集》, where it appears as 石鏊饼: it was first called 喭饼 and came from Tongzhou (同州, today Dali county in Weinan), whose litigious people would carry it to court as prison rations in case they lost their suit; later, he writes, sweet and savory seasonings were added, its name and nature changed, and it became a gift. In the Qing dynasty Yuan Mei recorded a kindred bread, 天然饼, in his 《随园食单》, baked on clean little pebbles so the surface came out naturally uneven. The exact age of the dish is not fixed, but its method preserves a very old way of baking.

You bite through a thin, brittle crust that shatters and gives way to a slightly soft, layered crumb, the surface dipped into little craters where the stones pressed and freckled brown where they scorched. The flavor is plain wheat warmed by oil, leaning savory with a little salt or, in the sweet kind, lightly sweet, sometimes with sesame or fennel. Good ones are evenly gold and snap clean, light in the hand and audibly crisp. A poorly made one is pale and doughy in the middle from too-cool stones, or scorched bitter on the high spots, or so hard all through that it tires the jaw rather than crumbling.

The pebbles are both oven and texture-maker. Heated in a heavy pan, small smooth stones hold a great deal of heat and release it fast and evenly through direct contact, baking the dough from both sides at once; oiling the stones keeps the dough from sticking and helps it brown. Where each stone touches, it conducts heat into a point and presses the dough down, so steam escaping elsewhere puffs the gaps while the contact points stay flat — this is what gives the pitted, dipped-and-blistered surface and the broken, layered crumb. The dough is made short with oil and not heavily kneaded, so little gluten develops and the bread bakes crisp and friable rather than chewy. With most of its moisture driven off in the dry, all-around heat, the finished bread resists going stale and keeps for a long time, which is why it travels well.