Potato & Celery Root Gratin with Leeks

Ingredients for Potato & Celery Root Gratin with Leeks

• 725ml double cream

• 2 garlic cloves, peeled

• 1 sprig thyme plus 3 teaspoons fresh thyme leaves, divided

• 2 tablespoons (1/4 stick) unsalted butter, divided

• 3 leeks, white and pale-green parts only, halved lengthwise, thinly sliced crosswise

• Kosher salt

• 900g russet potatoes, peeled, very thinly sliced crosswise (1/8" thick)

• 450g celery root, peeled, very thinly sliced crosswise (1/8" thick)

• 300g grated Gruyère

• Freshly ground black pepper

Preheat oven to 177°C. Heat cream, garlic, and thyme sprig in a medium saucepan just until bubbles begin to form around edge of pan. Remove from heat; set aside to steep.

Melt 1 tablespoon butter in a medium skillet over medium heat. Add leeks; season with salt and cook, stirring often, until tender (do not brown), 10-12 minutes. Transfer to a small bowl and set aside.

Butter a 3-quart gratin dish with remaining 1 tablespoon butter. Layer 1/3 of potato slices and 1/3 of celery root slices evenly over bottom of baking dish. Cover with 1/3 of leeks, then 1/3 of Gruyère. Sprinkle with salt, pepper, and 1 teaspoon thyme leaves. Repeat layers twice more. Strain cream mixture into a medium pitcher and pour over vegetables.

Set gratin dish on a large rimmed baking sheet and cover tightly with foil. Bake for 1 hour. Carefully remove foil; continue baking until top is golden brown and sauce is bubbling, 25-30 minutes. DO AHEAD: Can be made 2 hours ahead. Let stand at room temperature. Tent with foil and rewarm in a 300° oven until hot, about 20 minutes.

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While every effort has been made to ensure the information is accurate and up to date, individual needs may vary and dietary requirements can differ based on personal health conditions. Always check food labels and allergen information before preparing or consuming any recipe. If you have specific health concerns, allergies, intolerances, or are following a medically prescribed diet, seek advice from your GP, pharmacist, or a registered dietitian before making significant changes to your diet or lifestyle.