Rutabaga, Celery Root, and Potato Gratin
Rutabaga, Celery Root, and Potato Gratin
Ingredients
1 pound medium rutabaga,
trimmed, peeled, and cut into 1/8-inch-thick slices
1 pound medium Yukon Gold
potatoes, peeled and cut into 1/8-inch-thick slices
8 ounces small celery
root, trimmed, peeled, and cut into 1/8-inch-thick slices
1 3/4 cups heavy cream
6 (5-inch) thyme sprigs,
tied with kitchen twine, plus fresh thyme leaves for garnish
1 tablespoon kosher salt
1/2 teaspoon black pepper
Unsalted butter, for
greasing baking dish
1 ounce Parmesan
cheese, grated (about 1/4 cup), divided
Directions
Preheat oven to 400°F
with rack in middle position. Place rutabaga, potatoes, celery root, cream, and
thyme sprigs in a large saucepan. Cover and cook over medium, turning
vegetables occasionally, until cream just begins to bubble around edges of pan.
Continue cooking, turning vegetables occasionally, until vegetables are tender
on the outside but still crunchy in the center, 12 to 15 minutes, reducing heat
as needed to maintain a very gentle simmer. Remove from heat; stir in salt and
pepper.
While vegetable mixture
cooks, lightly grease a 2-quart baking dish or 10-inch cast-iron skillet with
butter and place on a rimmed baking sheet.
Remove and discard thyme
sprigs from vegetable mixture. Spoon half of vegetable mixture into prepared
pan; sprinkle with 2 tablespoons cheese. Top with remaining vegetable mixture,
pressing down gently to even top layer. Sprinkle with remaining 2 tablespoons
cheese.
Place baking sheet with
gratin in preheated oven. Bake until mixture is bubbling and vegetables are
tender, about 15 minutes. Increase oven temperature to broil (do not remove
gratin from oven). Broil on middle rack until golden brown in spots, 1 to 2 minutes.
Remove from oven; garnish with thyme leaves. Let cool 15 minutes.
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