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1
Pull off most of the leaves from each rosemary sprig, leaving a nice tuft of leaves at the top. Using a sharp knife, cut off the bottom of the sprig on a diagonal to give you a sharp point. Soak in water for at least two hours, or overnight.
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2
Toss the parsley and basil leaves into a food processor, add the bread crumbs, salt, pepper, and 1/4 cup of the olive oil, and zap until the herbs are chopped and the bread crumbs look green. Transfer to a pie plate or wide shallow bowl, add the shrimp, and toss to coat well.
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3
Skewer 4 or 5 shrimp on each rosemary spring (the easiest way to do this is line up 4 or 5 shrimp at a time on a work surface and run a skewer through them; then separate them slightly so they will cook evenly). Dredge on both sides in the bread crumb mixture, place on a platter, and put in the refrigerator for 30 minutes.
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4
Preheat a gas grill or prepare a fire in a charcoal grill. Put a piastra or a griddle on the grill to preheat.
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5
Spritz or brush the piastra or griddle with the remaining 2 tablespoons olive oil. Place the skewers on the piastra or griddle and cook, turning once, just until the shrimp are opaque throughout and some of the crumbs are browned, 2 to 3 minutes per side. Transfer to a serving platter and serve with the lemon wedges.
