It’s easy to make skewers from rosemary sprigs. Choose large sturdy sprigs that are about 8 inches long. Pull off most of the leaves from each sprig, leaving a nice tuft of leaves at the top (use the remaining leaves in the dish you are making or reserve for another use). Using a sharp knife, cut off the bottom of the sprig on a diagonal to give you a sharp point. The skewer will slide easily through the shrimp when you skewer them.

Toss the parsley and basil leaves into a food processor, add the breadcrumbs, salt, pepper, and ¼ 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.

Skewer 4 or 5 shrimp on each rosemary sprig (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.

Preheat a gas grill or prepare a fire in a charcoal grill. Put a piastra on the grill to preheat.

Spritz or brush the piastra with the remaining 2 tablespoons olive oil. Place the skewers on the piastra 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.