chorizo intelligence

Does anyone out there know what goes into Salvadoran style chorizo? A recipe or a list of ingredients would be great. The stuff is flavorful, but its difficult to identify ingredients, except for a few.
I plan to ask the people at the Pupuseria on 106th street when I can get over there again, but I don't expect a super-detailed response. (They make it in-house.)
My searchs on the internet have yielded nothing...any help would be appreciated.

And here I thought you were going to tell us that Doug had finally developed sentient sausage.