Stuffed Mushrooms
["12 large cap mushrooms (about 12 oz. total)", "4 sticks celery, finely chopped", "1 small onion, finely chopped", "2 oz. finely chopped walnuts", "1/4 c. bread crumbs", "4 Tbsp. chopped fresh parsley", "2 Tbsp. lemon juice", "salt and fresh ground pepper to taste", "1 egg, beaten", "2 oz. grated Cheddar (optional)", "6 Tbsp. chicken stock"]
["Wipe mushrooms and pull out the stems.", "Chop stems finely. Heat butter in frying pan and lightly brown the rounded sides of mushroom caps a few at a time.", "Set aside."]
["mushrooms", "celery", "onion", "walnuts", "bread crumbs", "parsley", "lemon juice", "salt", "egg", "chicken stock"]