"The classic French Onion Soup with Gruyere Cheese...."
INGREDIENTS
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For the Soup: 3 tablespoons unsalted butter, cut into 3 pieces 6 large yellow onions (about 4 pounds), halved and cut pole to pole into 1/4-inch-thick slices Table salt 2 cups water, plus extra for deglazing 1/2 cup dry sherry 4 cups low-sodium chick