Add the parsley, mint, thyme, garlic, scallions, lemon zest and juice, 1 1/2 teaspoons salt and 1/2 teaspoon pepper to the bowl of a food processor. Process until finely chopped. With the machine running, drizzle in enough olive oil to form a loose paste. Use as a marinade for flank or skirt steak, wiping off excess before grilling.
Recipe courtesy of The Kitchen Sink