Croque Monsieur is my favorite sandwich of all time. It is a toasted creamy, cheesy, little bit salty (from the ham) delight. A bite of it along with a mouthful of vinegary salad is truly divine. Another favorite? Crepes Suzette, thin, thin, thin pancake served warm, drenched in orange liqueur, bits of orange peel float around it to give you a little "bite."
I never gain weight while I am in France. I think it is a combination of walking (a lot-every day) and the spectacular food. I eat like a starving truck driver (anything I want-no diet here) but the food is so fulfilling I am sated...and find myself satisfied in a way that rarely happens in the U.S.