Ingredients
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1 medium head of green or savoy cabbage (about 3½ lb. total), cut through core into 8 wedges
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1½ tsp. kosher salt, plus more
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1 tsp. freshly ground black pepper, plus more
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2 medium shallots
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4 garlic cloves
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2 cups heavy cream
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1 Tbsp. thyme leaves, plus more for serving
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up to 3 oz. Gruyère, grated (about 1½ cup) – I prefer less cheese
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½ oz. Parmesan, finely grated (about ½ cup)
Directions
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Place oven racks in upper third and middle of oven; preheat to 350°. Place cabbage on a rimmed baking sheet and brush with oil; season lightly with salt and pepper. Roast until tender and edges are golden, 40–45 minutes. (This is an essential first step: It draws out the excess moisture, ensuring that the cream mixture doesn’t get watery.)
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Meanwhile, bring shallots, garlic, cream, 1 Tbsp. thyme, 1½ tsp. salt, and 1 tsp. pepper to a simmer in a small saucepan over low heat. Cook, stirring occasionally, until shallots and garlic are very soft, 15–20 minutes. Let cool slightly. Transfer to a blender; blend until smooth.
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Pour cream mixture over the cabbage. Bake on middle rack, uncovered, until cream thickens, 30–40 minutes. Let cool 30 minutes.
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Heat broiler. Sprinkle Gruyère and Parmesan evenly over cabbage. Broil until cheese is bubbling and gratin is deeply browned, about 4 minutes. Top with more thyme.
Do Ahead: Gratin (without cheese) can be baked 1 day ahead. Cover and chill. Bring to room temperature before sprinkling with cheese and broiling.
Servings: 8