French Onion Soup
["1 fresh onion (2 lb.)", "1/3 c. margarine", "1 Tbsp. flour", "1/4 tsp. pepper", "10 c. beef stock", "2 tsp. Worcestershire sauce"]
["Cut onion into thin slices; saute in margarine.", "Add flour and pepper; cook for 10 minutes.", "Add stock and Worcestershire sauce until onion is tender."]
["onion", "margarine", "flour", "pepper", "beef stock", "Worcestershire sauce"]