while i lived in venice, i had never eaten beans like these. since i have moved to florence, i eat them all of the time, when they are in season of course. mangiatutto means “eat it all” and that’s exactly what you do with these fine flat beans.
saute one medium fresh onion in olive oil and a drop of chili oil, if you have it, until golden brown. add the beans (whole, about 10 ounces), and a cup of chopped fresh tomatoes. add one teaspoon of salt, cover and cook on low heat until done. when they are done, throw in some chopped fresh basil. eat them while they are warm!