Potato Parsnip And Porcini Gratin

Our answer

Nigella's Potato, Parsnip And Porcini Gratin (from NIGELLA CHRISTMAS) is an easy to make but luxurious side dish that is perfect for the Christmas period. The vegetables are simmered in a cream and milk mixture until softened, then finished in the oven.

Both the vegetables and the liquid should be decanted (or transferred) to the baking or gratin dish as the vegetables will continue to cook in the oven and the liquid will thicken slightly. As the vegetables simmer in the saucepan, the milk and cream mixture will reduce very slightly but should still be enough to just cover the vegetables. If you have more liquid than this then you may want to keep the excess to add to a soup or use for mashed potatoes, though it is likely to only be a few tablespoons.