1
Season the flank steak with kosher salt and black pepper on both sides.
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2
Grill the steak for about 5 minutes on each side for medium-rare, or adjust the time according to your preferred level of doneness.
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3
In a bowl, combine the chopped parsley, oregano, minced garlic, olive oil, red wine vinegar, and red pepper flakes, if using. Mix well until all ingredients are incorporated.
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4
Serve the sliced steak with a generous amount of chimichurri sauce drizzled over the top.
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