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Preheat the broiler of your oven to low. Line a small baking sheet with parchment paper.
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Cut the loaf the long way, two times, being sure not to cut all the way through the loaf. Then cut width-wise about 5-6 times being sure not to cut all the way through the loaf. You want to make tiny cubes.
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Spread the butter all over the top of the loaf. Place on the prepared sheet and put in the oven for 2 minutes just to get that top a little golden.
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Remove from the oven. Stuff each little cut in the loaf with the shredded mozzarella cheese and giardiniera. Pour about 1/2 a cup of the au jus inside the loaf. Cover with the slices of fresh mozzarella.
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Place back under the broiler for about 5 minutes, until the cheese melts and gets super gooey.
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Meanwhile microwave the rest of the au jus for a minute so it is nice and hot and you can dip the bread in extra jus.
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Once the cheese is melted, remove from oven. Top with chopped fresh parsley. Use a fork or fingers to pluck off cubes of cheesy bread. Dunk in extra au jus if desired.