Here's my very American take on a very French idea
Preheat your oven to 375 degrees, open a tube of Pillsbury Crescent Rolls and roll out the dough. Separate a couple of rolls along the triangle perforations.
Spread mustard (I like to use Ken's Honey Mustard Dressing) and a triangle of Laughing Cow Swiss Cheese onto each roll. At on end of the roll add a few pieces of thinly sliced deli ham and roll up the dough.
Put each ham and cheese crescent onto a baking sheet and then pour melted butter over each. Sprinkle some sea salt onto the rolls and put into the oven and bake until the roll becomes golden (about 10 minutes).