Ever since I got into this sausage making thing, I find myself studying every label I can find at the supermarket. I'm curious to know what preservatives are used (intrates/nitrites for instance E249-E252), phosphates, etc. They usually do not give much away with regard to spices and seasonings, but some do - and they can give you some good ideas.
Today, I bought some sausage made in Poland - from PEK - which I think is a very large sausage maker there. I got some Kabanos, which are a pork sausage stuffed into thin casings with nitrite & spices, then hot smoked. The sausage goes all wrinkly and dry and can easily be eaten cold or grilled and are delicious.
On the other the label says Wiejska and is described as a traditional polish farmers boiling ring sausage. It is a very fat sausage - probably stuffed in an ox runner (assuming it is a natural casing - i have not opened the package yet), and tied together in a ring. It too has nitrite, and "spices", plus garlic. I'm not sure if this one is already cooked - but I suspect it has already been boiled.