It's snails cooked in butter and garlic from what John tells me about his trip to Paris.
Yeah, I had it the first time I went to France, when I was in high school. My dad ordered it. They were served in their shells, so you couldn't really evade the fact that you were eating snails. Oh, and fishing them out of their shells with a fork is quite a production.
Anyway, they tasted like a chewy, mostly flavorless, meat.
All of the flavor came from the sauce, which was little more than butter, garlic, and white wine.