Pulled Pork with Root Beer Sauce

Ingredients
1 (2 1/2 to 3 lb) pork sirloin roast
1/2 tsp salt
1/2 tsp black pepper
1 Tbsp cooking oil
2 med. onions, cut into thin wedges
1 cup root beer*
2 Tbsp minced garlic
3 cups root beer (2 12-oz cans or bottles)*
1 cup bottled chili sauce
1/4 tsp root beer concentrate (optional)
Several dashes bottled hot pepper sauce (optional)
8 to 10 hamburger buns, split (toasted, if desired)
Lettuce leaves (optional)
Tomato slices (optional)
*Do not use diet root beer

Directions
1. Trim fat from meat.  If necessary, cut meat to fit into a 3.5- to 5-quart crockery cooker.  Sprinkle meat with salt and pepper.  In a large skillet brown meat on all sides in hot oil.  Drain off fat.  Transfer meat to cooker.  Add onions, the 1 cup root beer, and garlic.
2. Cover and cook on low-heat setting for 8 to 10 hours or on high for 4 to 5 hours.
3. Meanwhile, for sauce, in a medium saucepan combine the 3 cups root beer and the chili sauce.  Bring to boiling; reduce heat.  Boil gently, uncovered, stirring occasionally, about 30 minutes or until mixture is reduced to 2 cups.  If desired, add root beer concentrate and hot pepper sauce.
4. Transfer meat to a cutting board or serving platter.  Using a slotted spoon, remove onions from cooking juices and place on a serving platter.  Discard juices.  Using 2 forks, pull meat apart into shreds.  To serve, if desired, line buns with lettuce leaves and tomato slices.  Add meat and onions; spoon on sauce.

Notes: This recipe comes from the Better Homes and Gardens 12th Edition Cook Book, and is one of their "Best Loved" recipes.  I have only had root beer pulled pork a few times in my life, but I have enjoyed it every time.