I have a question about the recipe "Porchetta" from Sara Jenkins. What if you can't find skin on pork shoulder roasts? Is there a substitution or alteration to the recipe?
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There's probably no substitution; the skinless version simply will be absent of the cracklings texture on the outside.
As for the recipe alternation, it is likely that the cooking time would be reduced. In any case, your goal is to reach the same internal temperature (170-180 degrees).
SMSF is a trusted home cook.
If you have access to a good butcher, they can probably order a skin-on shoulder for you. Of course not everyone has that option, but it's definitely worth asking for if you can.
Susan W is a trusted source on General Cooking.
Even my Albertsons has ordered a skin on roast for me. I think it took 3 - 4 days to get it to the store after ordering. Well worth it.