Mary Berry's Croque Monsieur, a super simple but absolutely delicious recipe that makes the best working lunch. Toasted, baked or grilled bread slices, smoked ham and cheese, dijon mustard and bechamel sauce, it can't get any better than that!
Preheat the oven to 220 degrees Celsius (430 Fahrenheit).
Melt half of the amount of butter, and brush all the bread slices on one side only.
Arrange the slices buttered side up on a baking tray and bake for 10 minutes or until golden and crispy.
Spread ¾ of the dijon mustard over 2 slices of bread (not the buttered side), and arrange 2 slices of ham and spread some grated cheese on top of each mustard-spread slice.
Place the other 2 slices of bread on top to make 2 sandwiches.
To make the sauce, melt the rest of the butter, add the flour and whisk well.
Pour in the milk, and whisk to get a smooth thick sauce.
Add the remaining dijon mustard, half of the remaining cheese and black pepper.
Top the two sandwiches with the bechamel sauce, and return to the oven for a further 10-15 minutes until golden and bubbling hot.