"This French onion soup recipe will knock your socks off! Made with the richest broth, perfect caramelized onions, and three types of cheese!..."
INGREDIENTS
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4 tablespoons unsalted butter
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5 large yellow onions (, thinly sliced)
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1 teaspoon salt
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1 teaspoon granulated sugar
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2 gloves garlic (, minced)
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1/2 cup red wine
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32 ounces low-sodium beef broth
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24 ounces low-sodium chicken broth
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1 tablespoon Worcestershire sauce
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2 sprigs fresh thyme
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1 bay leaf
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1/2 tablespoon balsamic vinegar
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pinch of salt and freshly ground black pepper ( , to taste)
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5 1-inch thick slices of French bread
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1 tablespoon extra-virgin olive oil
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1 1/2 cups shredded Swiss cheese (, room temperature)
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1/4 cup shredded Mozzarella cheese (, room temperature)
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2 tablespoons finely grated Parmesan cheese (, room temperature)