Recipe & Image taken from www.savuryandsweet.com
2 tablespoons unsalted butter
3 tablespoons plain flour
2 cups hot milk
1 teaspoon salt
1/2 teaspoon ground black pepper
12oz gruyere cheese, grated
1/2 cup parmesan, grated
8oz honey roast ham
Preheat oven to 400 degrees F.
Melt the butter over a low heat in a small saucepan and add the flour, stirring with a wodden spoon for 2 minutes.
Slowly pour the hot milk into the butter mixture and cook, whisking continuously until the sauce is thickened.
Off the heat add the salt, pepper, nutmeg, 1/2 cup grated Gruyere and the Parmesan and set aside.
Half the croissants, place the slices on two baking trays and bake for 4 minutes. Turn each slice over and bake for a further 2 minutes.
Lightly brush half of each croissant with mustard, add slices of ham and 1/2 the remaining Gruyere. Top with the other half of the croissant.
Smother the croissants in the cheese sauce and sprinkle with the remaining Gruyere before baking for 5 minutes.
Finally grill the croissants for 3-5 minutes until bubbling and browned.