The Ultimate Homemade McRib (Smoked Rib Sandwich)

Name: The Ultimate Homemade McRib (Smoked Rib Sandwich)
Prep time: 50 min
Cook time: 350 min
Total time: 400 min
Yield: 8 servings
Ingredients: 2 (2-pound; 900g) racks baby back ribs; 1 recipe Easy All-Purpose Barbecue Sauce and Rub (see note); 1 1/2 pounds (700g) boneless pork shoulder, cut into 1-inch cubes; 12g kosher salt (about 1/2 ounce; 1 tablespoon); 12g sugar (about 1/2 ounce; 1 tablespoon); 1 recipe Cemita Buns (see note); 1 recipe Quick Dill Pickles (see note); 1 white onion, thinly sliced