For the sauce: Combine the parsley, oregano, cilantro, garlic, crushed red pepper and 1 1/2 teaspoons salt in a food processor. Process until coarsely chopped. Add the vinegar and pulse to combine. Scrape the mixture into a bowl and whisk in the oil and 2 tablespoons water.
The sauce can be made 1 day ahead and refrigerated; bring to room temperature before serving.
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