https://munchies.vice.com/en_uk/article/bjqqz5/how-russia-fell-in-love-with-candy-bars-made-of-blood
Going through New York City once, saw a deli stand in a bus station (Port Authority?). They had all kinds of different, ethnic foods. One was a blood sausage. Never had come face to face with food using blood as an ingredient.
25 Things That Everyone Needs to Eat & Drink in Belgium https://iamaileen.com/top-belgian-food-good-eat-drink-belgium-dishes/
#15 Blood Sausage Bloedworst (Pensen or Beuling) / Boudin
Bloedworst
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This is a type of meat sausage that, as the name goes, is mixed with blood (it also has breadcrumbs). The mention of 'blood' might scare you from this but give it a try! It's delicious in its own way; it is grilled, sauteed, barbecued or eaten raw and best served with potatoes and apple sauce.
This is one of our regional specialities !! Food with blood is more widespread than you might think.