Cuban, you may like to know that you can get pure pig's blood soup. This soup is poplular in the north of Thailand, it is called "loo". The addition of herbs/spices such as lemon grass acts as a anti-coagulant, so it it does not set. I don't recommend it, but then again... everybody to their taste.
You may be interested in an amusing (??) story relating to loo. When I was in Phrae I was told about a young motorcyclist who was coming back from the market having bought a large bag of Loo for his family. To carry the bag he pushed it under his T-shirt. Anyway, he came off his motorbike and the bag burst spreading loo/blood all over the road and his T-shirt. He was not severely injured but the consensus of the bystanders was that he was he was certain to die!!
Pig Blood Used In Soups
in Thai Food
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