finally did it yesterday. i had a 9lb lamb shoulder. took it home and trimmed a bunch of fat off the top of it. rubbed it with salt, pepper, garlic and a little rosemary. most sources that i read talked about cooking for 12 hours and internal temperatures as low as 145. i put it on around 6:30AM with some hickory and cherry wood. cooked between 225 and 250 for 12 hours basting with the moonlite inn cooking dip every hour. internal temperature was about 160 when i took it off. i figured that this was fine based on what i had read.
(before you go on about how internal temperature is not a good measure of "doneness". i know. i know. but as this was my first time with lamb i needed some kind of measuring stick as i had no idea what done looked or felt like.)
anyway, after letting it rest i tried to "pull" it and it was nowhere near tender enough for that. so i figured, fine i guess that's why they call it "chopped mutton". so i started cutting the meat off the bones. The flavor was actually very good; good smoke flavor, the rub was a little too salty but it still had great flavor. BUT the amount of fat was a huge turn off. we ate it after spending a ton of time trying to get as much fat out as we could, but i have never seen anything like it.
my question now is; is this just how lamb is? extremely fatty? or is it just because i didn't cook it long enough to render more of the fat? like, if i pulled a pork butt off at such a low temperature would it be as fatty or not?