Yes, the famous Britsh black pudding, aka blood sausage.
Here it is as purchased. It is cooked but requires heating. I have peeled the skin, probably pig intestine, off the piece on the left, although this is not necessary.
Close up of the cut surface. The white bits are either fat or oats (or some other grain). The main dark red part is pig's blood.
Here it is as purchased. It is cooked but requires heating. I have peeled the skin, probably pig intestine, off the piece on the left, although this is not necessary.