We stumbled on this small scale street fair yesterday, with stalls run by a number of well known French restaurants.
Sandrine's: the flammekuche (sp?) surprised me. An open faced sandwich with some pretty good soft goat(?) cheese. Essentially a country combo of bread and cheese but dressed up nicely by bits of bacon and caramelized onions for a sweet smoky savor. The creme brulee was ok but undistinguished -- too wet due to the presence of raspberries, which turned the thin caramelized sugar crust slighty sticky. I like my creme brulee firm, buttery and somewhat stiffer (almost like the texture of brillat-savarin cheese) with a thick caramelized shell, so this version wasn't a match for my personal perference. I skipped their sausages because it was served hotdog style which I couldn't accept because I considered it a cultural faux pas that was particular jarring as this was Bastille Day event. Choucroute (sauerkraut) with sausage is very typically Alsatian, and I never saw it served in a roll there.
Brassierie Jo: this was my favorite stall, because they offered crepes, the quintessential French street food. I couldn't think of a better item to serve for such a setting. The crepes are made to order, with a supple texuture that holds a slight bit of bounce. I got a chocolate filling, a gentle sauce that was interesting but still allowed the light eggy flavor of the crepe room to express themselves.
Mistral: salmon rillettes on slices of croutons with plenty of depth and flavor. Easily my favorite savory item of the afternoon.
Metro: a decent profiterole that was filled with an excessively wet but bright tasting berry mixture and a soft custardly topping (thick creme anglaise?).
Sel de la Terre: I stole a bite of the sausage in a baguette from pal. Good meaty flavor, and soft chunky texture; if I had space, I would have bought it sans bread.