We tried to do this on Mothers Day, though we couldn't eat at every single place, we were ready to hurl.
Canada didn't have a cart or anything at the time, just Le Cellier (table service)
UK: fish and chips was yummy
France: cheese plate at bakery was esp great, though everything is good. They also have crepes at an outside cart but we didn't have tummy room to try it
Morocco: love Tangerine Cafe, split the chicken and lamb platter and it is delish
Mexico: tried the nachos at the Cantina, though they're pretty gross. It's one step below Taco Bell, but they do have churros that are decent
China: tried eggrolls, they were the same as everyplace else =)
Germany: pretzels are great!
Italy: doesn't have a counter or cart, just shops
Japan: were going to have sushi but had no room
Norway: bakery has some great things, we tried the schoolbread but weren't impressed - other things looked much better
We skipped USA because, well, we already live here!
Have fun!