No pork shoulder? That's crazy. There's always huge piles of them here and it's about the cheapest cut of meat you can buy.
When you say "shoulder" I assume you're talking about the "Boston Butt". I've been having fun doing really long slow cooks with the "Picnic". Sometimes with the skin on cut into a diamond pattern with a lot of dry rub, and sometimes peeled and wrapped in bacon. This was the last one I did...
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Here's a picture of the pig with the primal cuts marked for reference...
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Good coffee, good weed, and time on my hands...