I made this chimichurri for flank steak and although arugula is not traditionally used it's delicious and the arugula gives it a peppery bite. I used it to marinade the steak and also served on the steak. In the original recipe that I developed the steak is marinaded in the chimichurri and then the remainder is mixed with mayonaise as a condiment.
Makes Approximately 1 cup
You can either make this by hand or in the food processor. By hand finely chop the parsley and arugula, mince the garlic place in a mixing bowl and add the remainder of the ingredients. Stir to combine. In the processor add everything and pulse until its ground but not pulverized I pulsed it 4-5 times.