To make the chimichurri sauce, mix the vinegar, water, garlic, salt, pepper flakes, and black pepper. Whisk in the oil. When everything's blended, whisk in the parsley.
Preheat a grill or grill pan on high. Season the steak with salt and pepper and place it on the hot grill. For medium rare, cook it for 3 to 4 minutes on each side, or until a thermometer inserted into the thickest part reads 140°F. Trim the roots from the scallions and add the entire bunch to the grill just after you've flipped the steak. Cook the scallions until they're lightly charred, about 4 to 5 minutes.
Originally Submitted
4/19/2010
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