"Braising the fennel and simmering the potatoes in cream before assembling the gratin infuses them with extra flavor...."
INGREDIENTS
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2 tablespoons unsalted butter, room temperature, divided
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1 tablespoon extra-virgin olive oil
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2 fennel bulbs (about 1 1/2 pounds), trimmed, quartered, cored, thinly sliced (about 6 cups)
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Kosher salt, freshly ground pepper
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1/2 cup dry white wine or dry vermouth
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2 bay leaves
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2 1/2 pounds waxy potatoes (such as Yukon Gold), peeled, sliced 1/8-inch thick
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1 1/2 cups heavy cream
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1 1/2 cups whole milk
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1 garlic clove, halved
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1 cup shredded Comté or Gruyère
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