The best idea ever!!!  Last night we had dinner in a local touristy restaurant near the Pantheon, we experienced this complimentary dessert offering at our restaurant.  They simply bring this large wooden chopping block to your table with a gigantic piece of chocolate on it and you use the cleaver mounted on the board to cut off a piece to suite your taste!  Fabulous.  Can’t wait to find my own chocolate block to use with my guests.