04For the sandwich assembly:05Cut the ciabatta rolls in half lengthwise, leaving 1 long side intact. Scoop out the inside and discard. Combine the vinegar and olive oil in a small bowl and brush on the inside of each roll. Be sure to evenly and thoroughly cover all parts of the bread, (don't miss any corners.) You may have some vinegar-olive oil leftover.06Preheat the oven to 350 degrees F.07Lay 4 pieces of provolone cheese inside each roll. Spread an even layer of the pepper relish on 1 side of each roll. Again, make sure it is an even layer, every bite needs to be the same! Crinkle 2 pieces of ham and gently lay them in a fluffy even layer on the pepper relish. Repeat this process with the mortadella. It is very important that the meat is crinkled and NOT folded in a flat piece. A folded hunk of meat results in a thick dense sandwich that is difficult to eat. Also be sure that the ham and mortadella are evenly distributed throughout the sandwich. Close the sandwich and give a little press to secure. Wrap the sandwich in foil.08To finish the sandwich:09Bake the sandwich in the preheated oven for 15 to 20 minutes or until the cheese is melted and the sandwich is hot all the way through. A panino press is also a great way to heat this up.10Serve on individual plates and enjoy.11A great sandwich is truly a thing of beauty!