INGREDIENTS
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2 cups loosely packed fresh parsley
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3 scallions, coarsely chopped
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2 tablespoons capers, drained
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Zest and juice of 1/2 lemon
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2 anchovy fillets
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2 cloves garlic, smashed
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1/2 teaspoon dijon mustard
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1/3 cup extra-virgin olive oil, plus more for the grill
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Kosher salt
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1 flank steak (about 1 1/2 pounds)
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Freshly ground pepper
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2 or 3 medium tomatoes