"For a finishing touch of color and light, herby flavor, garnish the dish with chopped fresh flat-leaf parsley...."
INGREDIENTS
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1 (16-ounce) flank steak, trimmed
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4 teaspoons olive oil, divided
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3/4 teaspoon kosher salt, divided
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1/2 teaspoon freshly ground black pepper, divided
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1 1/2 teaspoons white wine vinegar
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1/4 cup finely chopped red onion
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1 pint grape tomatoes, quartered
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1 ounce crumbled blue cheese (about 1/4 cup)