INGREDIENTS
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1 1 1/2 pound flatiron steak
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4 tablespoons unsalted butter, at room temperature
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3/4 teaspoon coarsely ground black pepper
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1 tablespoon finely chopped Italian parsley
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Zest of 1/2 lemon
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1 large garlic clove, chopped and smashed to a paste (about 1 teaspoon)
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Kosher salt