I did the injection, next time I will try the mustard/rub deal.
The mustard merely acts as a glue to help stick your rub to the butt, you won't taste any mustard flavor.
Originally posted by P.Jean:
this one seems like a popular injection: http://www.virtualweberbullet.com/pork4.html
I used a cup of apple juice, 1/4 cup of vinegar, a tablespoons of my rub, 2 tablespoons of worchester, and a tablespoon of corn syrup.