Place the chopped onion and whole jalapeno peppers in the bottom of the crock pot. Squeeze the juice from oranges and place the rinds with the onions and peppers.
Coat the roast on all sides with the seasoning mixture and pat it in. Place the roast in the crock pot on top of the onions and peppers. Pour the orange juice over the roast.
Preheat oven to 425˚F. Place shredded pork in a thin layer on a large baking sheet. Bake for 6-10 minutes or until the pork edges are crispy to your liking.