2 1/2 pounds pork shoulder
1/2 cup chopped onion
1 clove garlic, minced
1/4 cup brown sugar
1 teaspoon dry mustard
1/2 teaspoon salt
1/4 teaspoon ground black pepper
2 cups ketchup
1/4 cup Worcestershire sauce

Cut boneless pork shoulder crosswise into 1/4 inch slices. Partially freezing it will make slicing easier.

Slow Cooker Recipe
In the slow cooker, combine sliced pork, onion, garlic, brown sugar, dry mustard, salt, pepper, ketchup, and Worcestershire sauce; mix well, and cover. Cook on Low, stirring occasionally, for 6 to 8 hours or until the meat is tender.