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Basil Arugula Spread: Combine all of the ingredients in the bowl of a food processor fitted with a steel blade and process until well blended.
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Flank Steak Pinwheels: Butterfly flank steak (with the grain) and open into one long strip.
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Pound until even and flat between two pieces of wax paper and season with salt and pepper.
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Smear basil arugula spread evenly over flank steak and sprinkle with parmesan.
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Lay the prosciutto in a single layer, then the provolone cheese slices over that.
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Roll up tightly into one long roll and tie off steak in 2 inch intervals. Trim the ends of the string and season with salt.
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Use a sharp knife to slice between the string and place the pinwheels on a sheet tray. Brush the pinwheels on both sides with olive oil.
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Preheat grill to med/high heat. Once grill is hot, grill pinwheels 3-4 mins per side.
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Cut and remove string and serve.