"This shingled sheets of thinly sliced potatoes are crispy on the outside, tender on the inside, and topped all over with deeply caramelized onions and melty cheese...."
INGREDIENTS
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2 pounds medium russet potatoes (about 4)
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5 tablespoons olive oil or clarified butter, divided
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1 1/4 teaspoons kosher salt, divided
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2 medium yellow onions (about 1 1/2 pounds total)
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1 cup shredded Gruyère cheese (about 4 ounces)
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1/4 cup dry sherry
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1 tablespoon unsalted butter