01 -
Toss together chopped giardiniera, green olives, black olives, garlic, and roasted peppers in a bowl. Pour in olive oil, vinegar, capers, celery salt, and black pepper. Give it a really good mix. Pop a lid on and chill for at least an hour, or it can hang out in your fridge all week.
02 -
Grab a bread knife and slice your loaf open sideways. Lay both parts out cut side up. If each half looks taller than 4 cm, pull out some of the soft center to make room for all the good stuff.
03 -
Start with half the olive salad (with oil) on the bottom bread. Next, put down half the mozzarella, then all the salami or pepperoni, half the provolone, all the mortadella or ham, add the rest of the mozzarella, capicola (or coppa/prosciutto), then finish off with the remaining provolone. Stack in this reversed order for layers of flavor.
04 -
Squeeze the last bit of oil from the remaining olive salad using your spoon right into the bowl. Pile the olive mix on top of your sandwich stack. Brush or drizzle some of that oil onto the inside of the top bread, then pop the top half over everything.
05 -
Wrap up your big sandwich tight in aluminum foil. Set something heavy (a Dutch oven or a couple bricks) on top. Leave at room temp for 1 to 3 hours so the flavors soak in and the whole thing gets pressed together.
06 -
If you want a toasty bite, set your oven to 190°C. Slide the wrapped sandwich in right on the oven rack. Let it heat up until the bread feels crisp, about 10 or 20 minutes.
07 -
Peel away the foil and cut the sandwich into wedges with your bread knife. Eat right away. Throw in chips or pepperoncini on the side if you’re feeling it.