I realized that I had this in my brined butt post, but neglected to put the recipe in the brine section.
1 gallon water
1 1/8 cup kosher salt
1 cup brown sugar
1/2 cup apple cider vinegar
1 tbsp garlic powder
1 tbsp onion powder
1 tbsp cayenne
2 tsp black pepper
1 tsp Instacure #1 pink curing salt (optional)
Put 1/3 of the water in a pan large enough to hold 1 gallon. Add the other ingredients, and heat on medium to simmer the brine. The idea is to melt all the salt and sugar, and help blend some of those spices into the liquid. I usually heat for 15-20 minutes, never bringing to a boil. Stir regularly.
Once the brine is blended, remove from heat and add the rest of the water in the form of ice cubes. I have a large sauce pan that has 1 gallon marked on the side, so I know the level - makes this much easier. This will immediately cool the brine. Once all the ice melts, I place the brine in the fridge to get cold. I don't take any chances by putting the meat in a brine that isn't below 40-degrees. Once the brine has chilled, place the pork butt in the brine. Let it brine for 12-13 hours.
After brining, rinse well, coat in yellow mustard and rub, and you're ready for the smoker! I know there are some that say you should never brine a pork butt, but you'll find it to be the most moist and flavorful pulled pork you'll ever have! Let me know if you have any improvements or variations!