In a saucepan, combine the milk, double cream, onion, garlic and bay leaves and heat over a medium heat until it just starts to boil.
2. Step
Take off the heat and leave to infuse for 10 minutes.
3. Step
Pour the milk mixture through a sieve into a jug.
4. Step
Then, in a saucepan, gently melt the butter and add the flour. Stir together over a low-medium heat for 1 -2 minutes.
5. Step
Gradually add the milk in three parts whilst continually stirring.
6. Step
Continue to stir and bring the sauce to a gentle boil.
7. Step
Take off the heat and stir in the dijon mustard and ground nutmeg.
8. Step
Next, brush the two slices of bread with the melted butter and grill for about 5 minutes until golden brown.
9. Step
Take out of the grill and preheat the heat the oven to 180°C (350°F).
10. Step
Flip the slices of bread over and spread one slice with a thin layer of dijon mustard, followed by another layer of the béchamel sauce, followed by the cheese and then the ham.
11. Step
Place the other slice of bread on top and coat with more béchamel sauce and cheese.
12. Step
Bake for about 15 minutes, until the cheese is bubbling.
