French Onion Soup
["1 large yellow onion", "1/4 lb. real butter", "2 beef bouillon cubes"]
["Peel onion and slice thinly. Melt butter slowly in pan.", "Add onion and cook slowly over low heat, stirring often, until onion is golden brown. Add 6 cups water and the bouillon cubes.", "Cook at least 1 hour. Sprinkle with Parmesan cheese when served."]
["yellow onion", "butter"]