Recipe from http://annieseats.wordpress.com/2008/09/30/spicy-shredded-pork/ who got it from the pioneer woman cooks blog listed in my favs
Spicy Shredded Pork

Ingredients:

4-7 lb. pork shoulder

1 onion, quartered

1 tsp. chili powder

1 tsp. dried oregano

1 tsp. ground cumin

¼ cup brown sugar

3-4 garlic cloves

1-2 tbsp. salt

pepper

1-2 tbsp. olive oil

2-3 tbsp. white wine vinegar

2 cups water



Directions:

Rinse and pat dry the pork shoulder.



Combine the onion, spices, brown sugar, garlic, salt and pepper to taste in the bowl of a food processor. Add the olive oil and white wine vinegar. Blend mixture until totally combined. Pour over the pork shoulder. Rub over the whole surface of the pork, being sure to cover any folds or crevices.



Place the pork in a Dutch oven or roasting pan and add water to the pan. Cover tightly and roast at 300° for several hours, turning once every hour. When it is fork tender turn the heat up to 425°, remove the lid, and roast skin-side up for 15-20 more minutes until crispy. Let rest 15 minutes.

Shred the pork shoulder using two forks. Pour some of the juice from cooking over the shredded meat to keep it moist.