This Georgian flatbread is from the region of Samegrelo, which borders the Black Sea. It is not, however, beach food. Stuffed with salty cheese and griddled, then heaped with even more cheese and baked, this is stick-to-your ribs winter cooking at its best. Georgians prepare this bread using a crumbly local cheese called imeruli, or a mixture of imeruli and the milder, more elastic sulguni. We substituted a mixture of low moisture mozzarella and strong, tart feta that gets you very close to the traditional version.