Biroldo is a very dark, brownish-red, soft-textured tuscan blood sausage about 4 inches (10 cm) wide, with lighter-coloured chunks of meat and fat in it. it was traditionally made from parts of the pig, offal such as heart, lungs and tongue, that wouldn't be used for other sausages. because offal was used, the sausage would start being made right away as soon as the pig was slaughtered so that the taste of the offal would be at its freshest. the offal is boiled for a few hours, then chopped up, seasoned and spiced. spices used include cloves, star anise, cinnamon, nutmeg, fennel, and garlic. then, pig's blood is added. the exact ingredients and proportions can vary by taste and family. it...

Source: Wikipedia