Combine all seasonings in a mixing bowl
Pat pork shoulder dry with a paper towel then rub with spice mixture
In a dutch oven, or any large pot, add pork shoulder, onion, bell pepper, and garlic
In a separate bowl, combine chicken stock, salsa, and white vinegar. Once combined, add to pot.
Cover and cook on low for 4-6 hours. The longer the better.
Remove the pork from the pot and onto a cutting board. Shred with two forks.
Add shredded pork to a baking pan and add 1/2 cup of the juice from the pot. Broil for 8 minutes.
Assemble your tacos, add toppings, and enjoy!