Place the trimmed pork shoulder into the slow cooker basin.
In a small bowl, whisk together the tomato puree, apple cider vinegar, honey, smoked paprika, garlic powder, onion powder, sea salt, black pepper, and cumin to create a clean BBQ sauce.
Pour the sauce over the pork, ensuring the meat is well coated on all sides.
Cover and cook on low for 8 hours or on high for 4 to 5 hours until the meat is tender enough to shred easily with a fork.
Remove the pork from the slow cooker, shred it using two forks, and then toss it back into the basin with the remaining juices to absorb all the flavor.
In a separate bowl, toss the shredded cabbage with lime juice to create a bright, crunchy slaw.
Lightly toast the whole wheat bun, then pile high with the pulled pork and top with the fresh lime slaw before serving.