Given the task definition and input, reply with output. In this task, you have to generate the title of the recipe given its required ingredients and directions.

ingredients: '1 qt. beef bouillon (2 cans plus 2 cans water)', '3 c. thinly sliced yellow onions', '1/4 c. butter', '1 1/2 tsp. salt', '1/4 c. sugar', '2 Tbsp. flour', 'grated Mozzarella cheese', 'grated Parmesan cheese', 'croutons or French bread, cut up',<sep> directions: 'Saute onions in butter slowly, covered.', 'Cook 15 minutes on low (not browned).', 'Add salt, sugar and flour, stir well.', 'Put all in crock-pot with bouillon.', 'Cook 6 to 8 hours on low or 3 hours on high.', 'Place croutons in bowl.', 'Add soup.', 'Top with grated cheeses.', 'Brown a little under broiler.'
French Onion Soup