French Onion Green Bean Casserole
""The iconic green bean casserole is reworked with the flavors of French onion soup -- caramelized onions and Gruyere cheese."..."
INGREDIENTS
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For the onions:
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2 tablespoons butter
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2 large yellow onions, thinly sliced lengthwise
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salt and ground black pepper to taste
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1 tablespoon sherry vinegar
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For the white sauce:
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2 tablespoons butter
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2 1/2 tablespoons all-purpose flour
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2 1/2 cups milk
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1 pinch ground nutmeg
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cayenne pepper to taste (optional)
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1/4 teaspoon ground thyme
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For the topping:
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2 tablespoons melted butter
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2/3 cup panko bread crumbs
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2 pounds fresh green beans, trimmed
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4 ounces shredded Gruyere cheese, divided
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1/3 cup grated Parmesan cheese
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