Slow Cooker Pulled Pork

3 lb boneless pork shoulder roast (well trimmed)
1 package McCormick slow cooker bbq pulled pork seasoning pouch
1/2 C ketchup
1/2 C firmly packed brown sugar (I used dark brown sugar)
1/3 C cider vinegar

Mix seasoning pouch with ketchup, sugar and vinegar, place roast in crock pot; pour mixture over roast and cover. Cook on low for 8 hours (or on high for 4 hours). Do not remove lid while cookSlow Cooker Pulled Porking.
When it's done shred the roast with 2 forks, stir to cover meat with gravy. Serve on rolls or buns.

* Substitute: Use 3 pounds boneless pork loin roast in place of the pork shoulder roast.