Let pork shoulder sit at room temperature for 1 hour. Cover in yellow mustard. Season with garlic powder, onion powder, cumin, salt, pepper, cayenne pepper, paprika, and brown sugar.
3 lb Pork Shoulder, Butt, 2 tbsp Yellow Mustard, 1 tsp Garlic Powder, 1 tsp Onion Powder, 1 tsp Cumin, 1 tbsp Salt, 1 tsp Black Pepper, 1 tsp Cayenne Pepper, 1 tsp Paprika, 1 tbsp Dark Brown Sugar