- 50g = 3.5 Tbsp
- 30g = 6 tsp
- 350F – 365F
Ideally, you would only wipe down your pan after use; if there’s residue and gunk that needs to be washed with soap and water, you will need to re-season the pan.
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.)
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.
Pour cream mixture over the cabbage. Bake on middle rack, uncovered, until cream thickens, 30–40 minutes. Let cool 30 minutes.
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
Yield: 4-4.5 Servings
Yield: 4-6 8oz containers
Note: Do not use gelatin if it is too hot, it will melt in the liquid. Agar-agar is more stable at room temperature.