Place the pork in a 6 qt slow cooker.
In a small bowl, combine all of the spices, and rub all over all sides of the pork. If you have extra seasoning, put it in the slow cooker too, don’t toss it.
Add the onion, and tomato sauce. Drain half of the juice from the pineapple chunks. Then add the pineapple and remaining juice to the slow cooker.
Cook on low 9-10 hours, until it shreds. Then keep on warm while serving.
Serve with warmed soft or hard tortillas. Top with Tomatoes, Sour cream, Avocado, and Cojita Cheese.
*Leftovers make a unique Pulled Pork sandwich! Use a Sweet Heat BBQ Sauce to compliment the subtle pineapple flavor in the pork.