Creamy potato and leek gratin recipe for a comforting dish

Ingredients for Creamy potato and leek gratin

• 4 050 g leeks, white and pale green parts only

• 45 g unsalted butter

• 900 g baking potatoes

• 360 ml double cream

• 240 ml full-fat milk

• 10 ml thyme leaves

• An adjustable-blade slicer

How to make Creamy potato and leek gratin

1. Preheat the oven to 200°C (fan 180°C) with the oven rack in the middle.

2. Generously butter a 2.5-litre shallow baking dish.

3. Cut a round of baking parchment to fit just inside a 30 cm heavy frying pan, then set the parchment aside.

4. Halve the leeks lengthwise, then slice crosswise into 4 cm pieces (you should have about 200 g). Wash the leeks thoroughly.

5. Cook the leeks in butter with ½ tsp salt and ¼ tsp pepper, covered with the parchment round, in the frying pan over medium heat. Stir occasionally until the leeks are tender, about 10–12 minutes.

6. Meanwhile, peel the potatoes and slice them crosswise into 1.5 mm thick slices using a mandoline. Transfer the slices to a large heavy pot.

7. Add the cream, milk, thyme, 1 tsp salt, and ½ tsp pepper to the pot with the potatoes and bring to a boil over medium heat, stirring occasionally (the liquid will thicken).

8. Stir in the cooked leeks, then transfer the mixture to the prepared baking dish.

9. Bake uncovered until the potatoes are tender, about 45 minutes to 1 hour.

10. Allow the dish to stand for 10 minutes before serving.

11. The gratin can be prepared up to 2 days in advance and chilled. Let it stand at room temperature for 30 minutes, then reheat, covered, in a 180°C oven until hot, about 30 minutes.

Disclaimer
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.