A Brine for any meat is based on Salt, Herb and Spices, if any, and Water. I like 1/2 Cup Morton Kosher Salt (3/4C Diamond Kosher or 1/4C Table Salt) per gallon of Water but 1 Cup is more commonly seen in recipes. The rest is up to your taste. You want an Apple flavor, Apple Juice Concentrate added to the Brine works well. You can add the common base flavors of Garlic(1 Head), Onion(1Lrg), Thyme(10+/- Sprigs), all fresh or dry (1-2Tbs) and even Carrots(4ea) and Celery(4 ribs). Then any Spices you like work well, 1Tbs Whole or 1-2tsp Ground. Black Pepper, a must have, and Allspice, Cumin, Clove, Cinnamon and Coriander are popular, as are Bay Leaves, but your favorite combination will work. With all these I would let the shoulders Brine 2-3 Days and Hot Smoke them at 225°F or higher until the meat is tender and can be pulled. If as mentioned above, a Pastrami or Ham tasting finished product is desired, add 1 Tablespoon of Cure #1 to the 1 Gallon of Brine and follow Pops soak timing and instructions...JJ