party. Saute onion in butter in a Dutch oven until tender. Blend in flour, stirring until smooth. Gradually add chicken broth, beef broth, water, and wine. Bring to a boil; reduce heat and simmer 15 minutes. Add pepper.Place 8 ovenproof serving bowls on a baking sheet. Place 1 bread slice in each bowl; ladle soup over bread. Top with 1 cheese slice; sprinkle with Parmesan cheese. Broil 6 inches from heat until cheese melts. Yield: 8 cups.