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["Preheat the oven to 350 degrees F.", "Make the spice paste: Use a mortar and pestle or spice grinder to coarsely grind the mustard seeds and fennel seeds. Transfer to the bowl of a food processor; add the rosemary, oil, garlic, salt and zest of 1 of the lemons, and pulse to make a coarse paste.", "Arrange the pork on a work surface, fat side up, and cut it lengthwise along one side, opening it like a book, with the fat side as the ""cover"" of the book. Spread the spice paste inside, then close. Arrange 4 prosciutto slices across the top of the pork, slightly overlapping. Carefully turn the pork over and arrange the remaining 4 prosciutto slices across the bottom of the pork. Tie the roast with kitchen twine at 1 1/2- to 2-inch intervals. Place in a 9x13-inch roasting pan with a rack, fat side up, and roast 1 to 1 1/4 hours, or until internal temperature is 145 degrees F. (medium rare) to 160 degrees F. (medium) on a digital meat thermometer.", "Transfer the pork to a cutting board and let rest 10 minutes.", "Meanwhile, make the wine broth: Place the roasting pan on the stovetop over medium-high heat. Add the shallots and cook, stirring occasionally, until tender, about 2 minutes. Add wine, bring to a boil, and cook, scraping up the browned bits, until the liquid reduces to 3/4 cup, 8 to 10 minutes. Remove from the heat and add the butter, stirring until it melts. Stir in the mustards, sage and thyme, plus the zest and 1 tablespoon of juice from the remaining lemon. Season with salt and pepper.", "Pour some of the sauce onto the bottom of a serving platter. Remove the kitchen twine from the roast and slice it, arranging the slices on the platter. Serve with the remaining sauce on the side."]
