Turn oven to high broil
In small bowl add 1/8 tsp salt and 1/8 tsp pepper
Along with vinegar, lemon juice, oil, onions, parsley and garlic
Stir the mixture well and set aside
Lay the flank steak out and cover with the rest of the salt and pepper
You may want to add more salt than just 1/8 tsp but its your preference
Spray a broiling pan with nonstick spray and add the steak
Steak should be sitting about 4-5 inches away from broiler
Cook 4 minutes on each side and remove
Heat a side pan on medium/high heat over stove
Place the steak on the pan and cook 1-2 minutes on each side to sear it
Stick in a thermometer and it should read 145-150 for the steak
Once its cooked to that temperature remove and top loosely with foil
After letting it sit for 5 minutes slice the steak going against the grain and top with the chimichurri sauce
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