INGREDIENTS
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10 tablespoons unsalted butter
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4 cups thinly sliced onions
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2 1/2 teaspoons salt
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1 1/4 teaspoons freshly ground black pepper
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5 pounds red bliss potatoes, peeled and thinly sliced into 1/8-inch rounds
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1 tablespoon finely chopped fresh thyme leaves
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1 1/2 cups chicken stock, or canned low sodium chicken broth