Onion Soup
["6 Spanish onions, sliced", "1 Tbsp. olive oil", "1 Tbsp. butter", "3 Tbsp. all-purpose flour", "3 cans (14 3/4 oz.) reduced-sodium beef broth", "1/4 c. dry sherry", "6 thick slices French bread", "6 slices Swiss cheese"]
["Cook onion in oil and butter in pot over medium heat, stirring frequently, 30 minutes until softened and caramelized.", "Stir in flour to coat onions; cook 1 minute.", "Slowly stir in broth. Cover; cook over low heat 20 minutes.", "Add sherry.", "Spoon soup into 6 individual ovenproof bowls.", "Top each with bread and cheese.", "Broil briefly to melt cheese.", "Serve."]
["onions", "olive oil", "butter", "flour", "beef broth", "sherry", "bread", "Swiss cheese"]