Must be a typo or unclear translation. It should be 1 regular chouriço, plus 1 chouriço de sangue (contains blood, looks completely black). I have had a look in my fantastic Portuguese book to see the ingredients for cozido.
It's my number one Portuguese dish, which surprises all Portuguese. This is how they know how much a foreigner loves their cuisine or country as it's not a dish many tourists know about or want to eat whilst on a short holiday.
Cozido de Portuguesa, is also Portugal's most loved dish, on par with sardinhas assadas.
