Spread each half of bread with the giardiniera. Arrange the capicola, mortadella, and provolone on the bottom bread half; top with remaining bread.
To serve sandwich warm, preheat the oven to 350 degrees F. Bake the sandwich until warmed through, about 5 minutes. Serve the sandwich warm or at room temperature.
This recipe was provided by professional chefs and has been scaled down from a bulk recipe provided by a restaurant. The Food Network Kitchens chefs have not tested this recipe, in the proportions indicated, and therefore, we cannot make any representation as to the results.