A croque monsieur sliced into two portions

The perfect croque monsieur

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(7 ratings)

Prep: 20 mins Cook: 30 mins

More effort

Serves 2

Master the croque monsieur with soft sourdough, gruyère, smoked ham and creamy mustard mayo. You'll relish every mouthful of this brunch classic

Nutrition and extra info

Nutrition: Per serving

  • kcal876
  • fat62g
  • saturates31g
  • carbs46g
  • sugars6g
  • fibre2g
  • protein31g
  • salt3.7g
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    For the sandwich

    • 4 slices from a white sourdough or crusty white



      Sourdough is a method of leavening bread, based on uncooked bread dough (known as 'mother…

    • 20g butter, melted



      Butter is a dairy product made from separating whole milk or cream into fat and…

    • 1 tsp Dijon mustard
    • 100g grated gruyère



      Gruyère is an undoubted pinnacle of traditional Swiss cheese-making, a culinary masterpiece as…

    • 4 thin slices of great smoked ham

    For the béchamel sauce

    • 125ml milk



      One of the most widely used ingredients, milk is often referred to as a 'complete' food…

    • 125ml cream



      Fresh unpasteurised milk quickly separates and the fat rises to the top. This fat layer is then…

    • 1 garlic clove, crushed
    • 2 bay leaves
    • 1 small onion, chopped



      Onions are endlessly versatile and an essential ingredient in countless recipes. Native to Asia…

    • 20g butter



      Butter is a dairy product made from separating whole milk or cream into fat and…

    • 20g plain flour
    • 1 heaped tsp Dijon mustard
    • fresh nutmeg, grated



      One of the most useful of spices for both sweet and savoury

    For the mustard mayo

    • 1 tsp Dijon mustard
    • 1 tbsp mayonnaise


    1. First, make a perfect béchamel sauce. Put the milk, cream, garlic, bay leaves and onion in a small pan over a medium heat and stir together. Heat until nearly boiling, then turn the heat off and leave for 10 mins to infuse. Pass the liquid through a sieve and discard the bay and onion.

    2. Melt the butter with the flour in another pan and cook over a gentle heat until it smells biscuity. Gradually whisk in the warm milk and bring to a gentle boil, stirring regularly, then add the Dijon mustard, a little grating of fresh nutmeg and some seasoning. It should be a lovely thick creamy sauce with a deep flavour.

    3. Brush the slices of bread with melted butter. Place them on a baking tray and toast one side under a grill, buttered-side up, until golden. Take them out and heat oven to 220C/200C fan/gas 7.

    4. Turn the bread over and spread each slice with a thin layer of Dijon, followed by a layer of the béchamel. Cover the sauce with grated gruyère, and then a slice of ham. Form the slices into two sandwiches, spread a thin layer of the sauce over the top slice and sprinkle more gruyère on top. Put the sandwiches in the oven and bake for 10-15 mins or until golden. Mix the mustard and mayo together and serve alongside.

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    Comments, questions and tips

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    17th Apr, 2020
    On day 28 (or 29 I've lost track) in the corona lockdown house I made this for our lunch except I couldn't put my hands on sourdough or gruyere so we made it with boring sliced slightly stale brown bread and strong cheddar and it was totes delish, enjoyed by all. And a homeschooling lesson in French cuisine for my kids
    26th Feb, 2020
    So good. I couldn’t be bothered making a bechamel today (used the mustard mayo in its place) but even so it was glorious. Great ham and gruyere are essential of course.
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