Roast Chicken With Mushroom Gravy
["3 1/2 lb. chicken, cleaned", "2 Tbsp. butter", "1 onion, chopped fine", "1/2 lb. fresh mushrooms, cleaned and diced", "1 tsp. chopped fresh parsley", "1/2 tsp. tarragon", "1 1/2 c. beef stock, heated", "1 Tbsp. tomato paste", "1 Tbsp. cornstarch", "3 Tbsp. cold water", "juice of 1 lemon", "salt and pepper"]
["Preheat oven to 425\u00b0.", "Place chicken in pan.", "Season with salt and pepper.", "Brush with lemon and butter.", "Roast 30 minutes in oven.", "Reduce heat to 350\u00b0.", "Cook for 1 1/4 hours more.", "Remove cooked chicken from pan and set aside.", "Discard 2/3 fat from pan. Place pan on stove over high heat.", "Add onion.", "Cook 3 minutes, stirring often.", "Add mushrooms and seasonings.", "Mix well.", "Cook 4 minutes over high heat.", "Mix beef stock and tomato paste.", "Cook 3 minutes more.", "Dissolve cornstarch in cold water.", "Stir into mushroom sauce and cook 1 minute.", "Serve roasted chicken with gravy and roasted potatoes."]
["chicken", "butter", "onion", "fresh mushrooms", "parsley", "tarragon", "beef stock", "tomato paste", "cornstarch", "cold water", "lemon", "salt"]