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For the cheese sauce

Nutrition: Per serving (6)

  • kcal376
  • fat26g
  • saturates15g
  • carbs14g
  • sugars7g
  • fibre5g
  • protein15g
  • salt1.5g

Method

  • step 1

    Set a large, deep pan over a medium-low heat and warm the oil and butter. When foaming, add the leeks, garlic and thyme along with a generous pinch of salt.

  • step 2

    Cook for 25-30 mins with the lid on, stirring frequently, until the leeks are completely softened and beginning to caramelise around the edges. Remove the thyme sprigs and discard.

  • step 3

    Meanwhile, make the sauce. Melt the butter in a pan over a medium heat, then stir in the flour. Cook for 1 min. Pour in the milk in a steady stream, whisking constantly, until you have a thick sauce, about 6-8 mins. When it comes to the boil, remove from the heat and stir in the nutmeg, mustard and both cheeses. Season, then stir in the leeks.

  • step 4

    Heat the oven to 200C/180C fan/gas 6. Lightly butter an ovenproof dish around 23cm wide. Mix the parmesan and breadcrumbs with a generous pinch of black pepper.

  • step 5

    Pour the leek mix into the dish. Will keep chilled for up to two days and frozen for up a month. Sprinkle with the parmesan crumbs and bake for 25-30 mins (5 mins longer if chilled, and an extra 10-15 mins from frozen), until golden.

Recipe from Good Food magazine, Christmas 2023

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A star rating of 4.2 out of 5.5 ratings
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