INGREDIENTS
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2 large lemons, scrubbed and thinly sliced
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6 garlic cloves
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1 tablespoon ground fennel
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3/4 cup extra-virgin olive oil
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1 tablespoon freshly ground black pepper, plus more for seasoning
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3 1/2 pounds butterflied boneless leg of lamb
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Salt
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4 cups water
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1 cup coarse polenta (not instant)
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1 cup milk
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2 tablespoons unsalted butter
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1/2 cup mascarpone
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1 cup freshly grated Pecorino Romano cheese
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1/4 cup chopped flat-leaf parsley
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2 tablespoons prepared horseradish