This is boxed flammekueche, also known in English as a flambéed tarte. I like it as a non-acidic alternative to pizza, since there's no tomato sauce... Pronounced flahm-kooh'-kuh.
It's an Alsatian dish that's often made with fromage blanc (a sort of soupy creamy white cheese), onions and small bits of fatty ham called lardon.
Flammekueche is one of the most famous dishes from Alsace, in the upper northeast part of the country.