INGREDIENTS
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1 1/2 pounds flank steak
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1 cup olive oil
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1 cup fresh cilantro leaves
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1/2 cup fresh basil leaves
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1/2 cup fresh flat-leaf parsley
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1/4 cup fresh lime juice
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5 cloves garlic
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1 tablespoon kosher salt, plus more for seasoning
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1 (14-inch) loaf ciabatta bread
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2 tablespoons canola oil
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1 medium onion, thinly sliced