1 pork shoulder, 5 pounds
1 tablespoon garlic powder
3 tablespoons salt
1 tablespoon black pepper
2 tablespoons chile powder (optional)
5 large hickory chunks 2 to 4 inch-sized for smoker (use chunks, not chips)
1 bottle dark beer, 12 ounces (optional)
1 cup of a sweet-tangy barbecue sauce, plus more for passing at table