Ingredients
  • 4 tablespoons butter
  • 1 teaspoon salt
  • 2 large red onions, thinly sliced
  • 2 large sweet onions, thinly sliced
  • 1 (48 fluid ounce) can chicken broth
  • 1 (14 ounce) can beef broth
  • 1/2 cup red wine
  • 1 tablespoon Worcestershire sauce
  • 2 sprigs fresh parsley
  • 1 sprig fresh thyme leaves
  • 1 bay leaf
  • 1 tablespoon balsamic vinegar
  • salt and freshly ground black pepper to taste
  • 4 thick slices French or Italian bread
  • 8 slices Gruyere or Swiss cheese slices, room temperature
  • 1/2 cup shredded Asiago or mozzarella cheese, room temperature
  • 4 pinches paprika
Steps

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