INGREDIENTS
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4 Tablespoons unsalted butter
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5 medium yellow onions, peeled and sliced thin
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1/2 teaspoon coarse salt
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6 cups chicken broth
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1 3/4 cups beef broth
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1/4 cup dry red or white wine
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2 Tablespoons chopped fresh parsley
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1 Tablespoon chopped fresh thyme
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1 bay leaf
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1 Tablespoon balsamic vinegar
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Salt and black pepper
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1 French baguette loaf, cut on angle into 3/4 inch slices
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4 1/2 ounces Swiss or Gruyere cheese, sliced thin
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3 ounces Asiago cheese, grated