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1
In a medium bowl, combine the garlic, scallions, parsley, salami, Fontina, Parmigiano, and bread crumbs and mix well. Add 1/4 cup of the olive oil and mix well with your hands or a spoon. Set aside.
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2
Cut six 15-inch-long pieces of kitchen twine. Open out the beef; season on both sides with salt and pepper, and place it on a work surface so a long side is toward you. Spread the bread crumb mixture evenly over the beef, leaving a 1/2-inch border along the side farthest from you; press and gently pack the stuffing mixture onto the beef to keep it in place (you may have a little stuffing left over-it makes a great panini filling). Starting from the side nearest you, roll up the meat like a jelly roll, pressing any stuffing that falls out of the ends back into the roll, and tie tightly with the twine, spacing the ties evenly (it's easier if you have a friend to tie the beef while you hold the roll together). Wrap tightly in plastic wrap to make a compact roll, and place in the refrigerator for at least 2 hours, or as long as overnight.
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3
Preheat a gas grill or prepare a fire in a charcoal grill.
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4
Carefully unwrap the beef roll and, using a very sharp knife, cut it between the ties into six thick pinwheels. Brush gently on both sides with the remaining 3 tablespoons olive oil and season with salt and pepper.
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5
Gently lay the pinwheels on the hottest part of the grill and cook, unmoved, for 5 to 7 minutes. Using a spatula, carefully turn each pinwheel over and cook for about 4 minutes longer for medium-rare. (Don't be alarmed if some of the cheese in the stuffing starts to melt and char on the grill, making kind of a savory Florentine-cookie-like thing; but if you find it charring too much, move the pinwheels to a slightly cooler part of the grill.) Transfer to a platter and serve.
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6
To butterfly the beef, simply use a sharp knife to cut it horizontally almost but not all the way in half, starting from one of the long sides, so you can open it out like a book.
