Best Classic French Onion Soup - Once Upon a Chef
"TESTED & PERFECTED RECIPE -- A rich caramelized onion broth topped with toasted bread and Gruyere make this French onion soup the epitome of comfort food...."
INGREDIENTS
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4 tablespoons unsalted butter
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1 tablespoon vegetable oil
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3 pounds Vidalia (or sweet) onions (about 5 medium), halved lengthwise and thinly sliced
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3/4 teaspoon salt
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1/2 teaspoon freshly ground black pepper
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3/4 teaspoon granulated sugar
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1 cup dry white wine
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2 tablespoons all-purpose flour
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6 cups beef broth
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1 teaspoon Worcestershire sauce
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1/2 teaspoon dried thyme
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2 bay leaves
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1 small baguette, cut into 1/2-in slices
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1 tablespoon dry sherry
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8 ounces Gruyère cheese, grated (about 2 heaping cups; look for one imported from Switzerland)
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1/2 cup grated Parmigiano Reggiano
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