Discard husks and stems from the tomatillos. Cook whole tomatillos in boiling water 10 minutes or until tender; drain. Place tomatillos in a blender; process until smooth; set aside.
Place stock and the next 5 ingredients (stock through hominy) in a large stockpot; bring to a boil. Cover, reduce heat, and simmer 35 minutes or until chicken is done. Remove chicken from bones; shred. Stir in pureed tomatillos and salt; cook for 5 minutes or until heated. Stir in chicken, and serve with cilantro, sour cream, and lime wedges.
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