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1 (3- to 4-pound) boneless pork shoulder or pork butt
1 tablespoon kosher salt
1 teaspoon freshly ground black pepper
1/2 cup pickling liquid from a (16-ounce) jar sliced pickled jalapeños
1/2 cup maple syrup
Trim off any large pieces of fat from the pork. Season all over with the salt and pepper, then place in a 4 1/2-quart or larger slow cooker. Pour in the pickling liquid and maple syrup. Cover and cook on the LOW setting until the pork is tender, 8 to 10 hours.
Transfer the pork to a clean cutting board and shred with 2 forks or your fingers. Serve the pork on warm 6-inch corn tortillas with more pickled jalapeños, diced white onion, and chopped fresh cilantro.