Coat pork shoulder liberally with your favorite rub (ex. brown sugar, paprika, black pepper, kosher salt, smoked chipotle tabasco sauce, cocoa powder).
Vacuum seal—important to use a sealer, not Ziploc bags for this one because of the long cooking time.
Cook sous vide at 149°F for 36 hours.
Run bag(s) under cool water until they’re cool enough to handle, then shred the pork by smooshing it with your fingers still in the bag. It will shred easily.
No searing necessary, but if desired, add quick char in a rocket-hot cast-iron skillet. Put on tacos with your favorite toppings.
Notes
You can substitute chicken thighs and keep the temperature the same. Cook for 2 hours, up to 12 hours. In this case, you can use a Ziploc bag.