"About as good as it gets! This is the version of French Onion Soup that people seek when they go to restaurants. I have been making it for 30 years and it never fails to please. It makes an exquisite presentation, too!..."
INGREDIENTS
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4 tablespoons butter
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1 teaspoon salt
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2 large red onions, thinly sliced
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2 large sweet onions, thinly sliced
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1 (48 fluid ounce) can chicken broth
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1 (14 ounce) can beef broth
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1/2 cup red wine
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1 tablespoon Worcestershire sauce
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2 sprigs fresh parsley
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1 sprig fresh thyme leaves
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1 bay leaf
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1 tablespoon balsamic vinegar
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salt and freshly ground black pepper to taste
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4 thick slices French or Italian bread
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8 slices Gruyere or Swiss cheese slices, room temperature
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1/2 cup shredded Asiago or mozzarella cheese, room temperature