Alsatian flammekueche, french tarte flambée, german Flammenkuchen, is a absolutely delicious local speciality. A then dough, covered with a mixture of cottage cheese and sour cream (some add a little white wine to the the mixture, and/or nutmeg), sprinkled with onion, bacon bits. A few minutes in a very hot oven, et voila! You can add mushrooms, cheese, and so on, or skip the onions and bacon, and replace them with fruits, Nutella, whatever tickles your fancy. I'll stick the previous, aka "traditionnelle".
And here is what it looks like (this one with cheese):