Michettas are similar to kaiser rolls. Traditionally known as "kaisersemmel," they are recognizable for the stamped dough and hollow center. From what I have heard, they were the cultural mash-up from the Austro-Hungarian domination of Italy's Lombardy region. Apparently there is a Roman version, as well.  While trying an old formula that had previously given me "issues," I reworked it recently. The batch below failed so far as lacking a hollow center. But they weren't bad.