Preheat oven to 350°F (175°C). Soak toothpicks in water.
In a small bowl, combine garlic, shallot, olive oil, parsley, sage, and basil. Mix into a paste.
Butterfly and pound flank steak into a flat rectangle, about 1/2 inch thick. Position with grain running side to side.
Spread herb paste evenly over the surface, leaving a 1-inch border at the top.
Layer with prosciutto and then provolone, also leaving a top edge border.
Starting from the bottom, roll the steak up tightly. Place seam-side down.
Tie with kitchen twine every 1 inch to secure. Slice into 1-inch pinwheels between twine ties.
Season pinwheels lightly with salt and pepper. Skewer with toothpicks.
Heat a cast iron skillet over medium-high heat. Sear pinwheels for 3 minutes per side.
Transfer skillet to oven and roast for 8–10 minutes, until cooked through.
Remove from oven and tent with foil. Rest 5 minutes before removing twine and toothpicks.