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Caramelized Balsamic-Red Onion Soup With Cheese-Topped Croutons

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Caramelized Balsamic-Red Onion Soup With Cheese-Topped Croutons

Ingredients

  • 1/4 cup olive oil
  • 1 tablespoon butter
  • 6 large red onions, thinly sliced
  • 2 teaspoons salt
  • 1/4 cup balsamic vinegar
  • 2 tablespoons soy sauce
  • 2 tablespoons prepared mustard
  • 6 cups water
  • 1/8 teaspoon freshly ground black pepper
  • 6 slices french bread
  • 3/4 cup grated swiss cheese
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