Hot answers tagged roast
I recommend roasting them separately (although at the same time) for one main reason: More surface area means more of the delicious brown crispy bits on the surface. It will also take less time, probably, than if they are piled together or if you get an entire shoulder, but that is less important. I disagree respectfully with MandoMando: pork butt cooked ...
You can keep them together, but I would recommend budgeting a very long time for cooking. In my opinion, your better bet would be to slow roast them in the oven, with some air space between the two roasts. I would also consider cutting each roast in half. Four 7-8 pound pork butts will cook much faster than two 15-16 pound ones.
The time is determined by thickness of the roast more than the weight. It takes longer for the heat to penetrate depth. I would do them separately for less humidity in the roaster and lower load on the roaster (unless your roaster is so big that it doesn't care). Crowding ovens and roasters isn't optimal. Patting them dry and rubbing oil on them also ...
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