Place chicken in saucepan cover with water. Add 1/4 of onion, salt to
taste and peppercorns. Simmer 45 minutes. Cool chicken in broth. Drain,
reserving 1/4 cup broth. Bone and shred chicken. Wash husked tomatillos
and place in medium sauce pan. Add 1/2 inch water. Bring to a boil,
reduce heat, cover and simmer 10 mins. or until tender. Drain and cool
slightly. Place cooked tomatillos, remaining onion and garlic in blender
and puree. Heat olive oil in medium saucepan. Add tomatillo mixture,
reserved broth and 1/2 tsp. salt. Simmer covered 15 mins. Soften
tortillas in oil. Place 1/6 chicken on each softened tortilla; add a
spoonful of sauce. Fold tortilla over filling; top w/cheese and more
sauce.