INGREDIENTS
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1 flank steak (about 1 1/2 lb.), trimmed
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Salt and pepper
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1/2 cup olive oil
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1 small onion, finely chopped
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1 clove garlic, minced
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2 tablespoons capers, chopped
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1/2 cup chopped fresh parsley
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2 teaspoons lemon juice
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1/4 teaspoon crushed red pepper
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1 tinned anchovy fillet, rinsed, dried and finely chopped, optional