Salmiakki (Denmark, Finland, Netherlands)
I have personally met this snack, and was humbled (and a little bit grossed out) by it. An incredibly popular treat in Denmark, Finland, and the Netherlands, Salmiakki is basically salty black licorice. Like, the saltiest and blackest licorice you can possibly imagine... or what you'd get if you tried to make soy sauce into a candy.
But mosquito eggs? Nice! Sweet (or however that tastes) revenge for all the blood they took from me!
Even in Florence there's a typical meal called "lampredotto": it's one of four cow's stomach boiled in water with tomatoes, celeries, carrots and served in a sandwich with green sauce ("extravergine" olive oil, caper and parsley), hot chili pepper or simply with pepper and salt.
In many other place of Italy, pork blood is used to make sweet pies.
Also in Sardinia and Rovigo (city near Venice) the people ate cats