I just came home from an afternoon spent at Giardino dell'Orticoltura where the stunning Tepidarium has been opened up to host three days of Florentine (actually Italian and international) street food. A great concept with lots of simple, yet delicious food (unfortunately also lots of people which made the location a bit crowded but that's how these events are) from all over Italy and the rest of the world.
I had a Mexican veggie burrito and a Roman Trapizzino (which I had never heard of). Both were delicious and very reasonably priced. If you like beer you can try some of the so called "birre artigianali" to go with the food.
The event takes place until tomorrow night so now you know where to spend your Sunday!
More info here: www.cucinedistrada.it