For Injection Marinade: Chris Lilly's Pork Injection Recipe:
¾ cup apple juice
½ cup water
½ cup white sugar
¼ cup table salt (I would start with 1 Tbls of salt. Add more to taste.)
2 Tbls Worchestershire Sauce
Instructions
Remove pork shoulder butt from package and rinse with cold water.
With a sharp knife or kitchen shears, remove some of the thick layer of fat (called the "fat cap").
Inject meat with marinade as you slowly remove the needle from the meat. Do this throughout the meat until most or all of the marinade is gone.
Next, rub the meat with your seasoning/BBQ rub.
Start your charcoal and set-up your grill for low, indirect heat (225°F).
Once your coals are ready, place your meat on the grill and insert a BBQ thermometer in the meat so that you can monitor the internal temperature of the meat. That is the key to this entire process.
Add 1 chunk of hickory and 1 chunk of apple wood to the hot coals.
If you're using charcoal briquettes, add 12 briquettes to the hot coals every hour. If you're using lump charcoal, add more as necessary.
Add 1 hickory and 1 apple wood chunk to hot coals every 30-45 minutes for the first 4 hours.
Smoke the Boston butt pork roast until it reaches an internal temperature of 180°F (approximately 60-90 minutes per pound). Then remove the meat from the grill, cover loosely with foil and let it rest for 15 minutes before slicing.
Recipe by Big Ken's BBQ at http://bigkensbbq.com/recipes/pork/shoulder-roasts/boston-butt-roast/