Just came back from a lovely trip to Europe w/ the Mrs. We had a nice long stay in Paris, France. Croque Monsieur is a popular dish served in Parisian cafes. Had not heard of the dish until this past trip and ordered it by chance. It is basically a crunchy ham sandwich with a lot of cheese. As soon as I came back home, I knew I had to try to make it myself.
Recipe: http://www.foodnetwork.com/recipes/ina-garten/croque-monsieur-recipe.html
And for reference purposes, this is how a croque monsieur looks like served in a cafe:
Croque Monsieur purchased at a cafe.