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1
Combine water, lamb chops, stout beer, large onion, celery, parsley sprigs, 5 sprigs thyme, garlic, 1 1/2 teaspoon salt, allspice, black pepper, and 3 bay leaves in a slow cooker to make broth.
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2
Cook on High until flavors combine, about 4 hours. Let cool, at least 30 minutes. Place lamb chops in a resealable plastic bag. Strain broth into a bowl; discard solids. Refrigerate lamb chops and broth, 8 hours to overnight.
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3
Combine flour, savory, 1 tablespoon garlic and herb seasoning, salt, and pepper in a brown paper bag. Add cubed lamb; shake until coated.
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4
Heat 1 tablespoon olive oil in a large skillet over medium-high heat. Add 1/3 cubed lamb; cook until browned, 1 to 2 minutes per side. Repeat with remaining olive oil and cubed lamb. Transfer browned lamb to the slow cooker.
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5
Skim fat off the chilled broth and pour into the slow cooker. Trim and bone lamb chops; dice lamb meat and add to the slow cooker. Stir in remaining 5 sprigs thyme and bay leaf, rutabagas, potatoes, cabbage, baby carrots, and small onions.
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6
Cook on High until lamb is tender, about 4 hours. Discard thyme sprigs and bay leaves. Stir in leek, chopped parsley, and 1 teaspoon garlic and herb seasoning. Cook until flavors combine, 2 to 3 minutes more.
