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1
In a heavy, dry skillet over moderate heat, toast cardamom, coriander, peppercorns, cumin, allspice, and chiles, stirring often, until fragrant, about 1 to 2 minutes. Remove from pan and let cool. Using spice or coffee grinder, grind spices and chiles to semi-fine powder. In small bowl, stir together spice powder and salt.
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2
Pat lamb shanks dry. Measure 1 teaspoon spice mixture into separate small bowl and set aside. Rub remaining mixture over shanks and refrigerate at least 6 hours and up to 24 hours.
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3
Preheat oven to 350u00b0F.
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4
In 8-quart heavy pot over moderately high heat, heat 1 tablespoon oil until hot but not smoking. Working in batches (wipe pan clean and add 1 tablespoon oil between batches), sear shanks, turning occasionally, until brown on all sides, about 5 minutes per batch. Transfer as browned to large roasting pan.
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5
Do not clean fat from pot. Lower heat to moderate and add onions, cloves, and bay leaves. Saute until onions are soft, about 8 minutes. Stir in reserved teaspoon spice mixture and saute until fragrant, about 30 seconds. Whisk in wine, lamb stock, tamarind paste, rosemary, thyme, brown sugar, celery root, ginger, garlic, and salt, then raise heat and bring to boil. Pour mixture over shanks, cover tightly with foil, and braise in middle of oven until meat is very tender, about 2 1/2 to 3 hours.
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6
Transfer shanks to large plate and cover loosely with foil to keep warm.
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7
Pour braising liquid through fine-mesh strainer into 6-quart heavy saucepan, pressing on solids with back of spoon. Place saucepan over moderately high heat and bring to boil, then lower heat and simmer, uncovered, until sauce is reduced by half (to about 4 cups), about 25 minutes.
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8
Remove string from shank and serve with 1/2 cup of sauce.
