"Enriched with two kinds of cheeses, this gratin is easy to prepare, as it does not call for layering the potatoes in a baking dish. Instead, chunks of potatoes are simmered on the stovetop in a fry pan, along with the ingredients for the sauce. Then the gratin is baked in the oven until golden brown and bubbling...."
INGREDIENTS
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1 Tbs. unsalted butter
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1 shallot, finely chopped
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2 Tbs. all-purpose flour
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1/2 cup chicken stock
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1/2 cup heavy cream
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1 cup grated Gruyère cheese
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1 tsp. chopped fresh thyme
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Salt and freshly ground pepper, to taste
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3 lb. Yukon Gold potatoes, peeled and cut into 1 1/2-inch chunks
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1/2 cup grated Parmigiano-Reggiano cheese