Trim your pork roast of any large pieces of fat and slice into 1/4 inch thick strips or pieces. Place the pork into a 5 to 7-quart slow cooker.
Add ground cumin, chili powder, cayenne pepper, garlic powder, ground cloves, and salt to the slow cooker, sprinkling it over the top of the meat.
Pour the vegetable oil over the meat and spices. Yes, it is a lot of oil, but fear not. If you skimp you won't get the same results.
Use tongs or your hands to toss together until the spices are evenly distributed and the meat is coated.
Cover with the lid and cook on the low setting for 6-8 hours until the meat can easily be shredded with a fork.
Shred the meat and serve as a main dish, or use in tacos, burritos, quesadillas, or enchiladas.
Video
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Notes
TO CRISP ON THE STOVE: Heat a large skillet over medium-high heat. Work in batches and use tongs to place the shredded meat into the pan and saute until crisp, about 3 to 5 minutes. The meat should still have oil on it from the slow cooker.
TO CRISP IN THE OVEN: Spread shredded carnitas out onto a baking sheet in an even layer. Place under the broiler setting in your oven for 3 - 5 minutes until crisp.