Lacinato Kale Gratin From 'A Boat, a Whale & a Walrus'

Ingredients (5)

• 3 bunches lacinato kale (about 1 1/2 pounds total before trimming), tough ribs removed, chopped into 3-inch sections
• 1/2 teaspoon freshly grated nutmeg
• Kosher salt and freshly ground black pepper
• 3 cups heavy cream
• 8 ounces sharp white cheddar cheese, such as Beecher’s Flagship, cut into 1/8-inch-thick slices