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1
Preheat Oven 300F (150C).
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2
Pat the lamb shanks dry and season with salt and pepper. Heat the oil in a large frying pan over medium-high heat and brown the lamb shanks on all sides. Transfer shanks to a plate. Add onions to the pan, stirring well to coat in the fat, then cover and cook for 10 minutes, or until soft, stirring 2 or 3 times while scraping the bottom of the pan each time.
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3
Add the carrots, celery and rosemary; cook uncovered for 2 to 3 minutes, scraping the bottom of the pan from time to time. Pour in the beer and bring to a boil, deglazing the pan by scraping up the browned bits from the bottom. Add the sugar, mustard and garlic and continue to boil, stirring from time to time, for 10 minutes, or until the beer becomes thick and syrupy.
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4
Meanwhile, remove 4 large strips of zest from the orange with a vegetable peeler and squeeze 1/4 cup (50 mL) juice from the orange. Add the zest and juice to the pan. Continue to cook until the liquid just glazes the onions. Remove from the heat and let it cool. You will have 3 to 4 cups (750 mL to 1 L) onion mixture.
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5
Cut four, 15 inch (38-cm) squares of parchment paper. Divide the onion mixture among the squares of parchment paper, placing it in the middle of each square. Make sure that each square has a rosemary sprig, an orange zest strip and 2 garlic halves. Stand a lamb shank on top of each (it will lean to one side); pull up the corners of the parchment paper to form a package, tying it with string, around the exposed bone.
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6
Stand the packages in a Dutch oven or baking dish and bake for 3 hours.
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7
Remove from the oven and place the packages on warmed plates. Cut the strings but allow each diner to open his or her own package.
