Remove ribs from refrigeration 1 hour before smoking to bring to room temperature.
Place ribs bone-side up and remove the thin, silvery membrane by loosening it with a knife and pulling it off with a paper towel.
Flip ribs meat-side up and trim excessively thick fat caps to about ¼ inch (6 mm). Pat completely dry with paper towels.
In a small bowl, combine all dry rub ingredients and whisk until evenly distributed.
Apply a thin layer of yellow mustard or olive oil to all sides of the ribs as a binder.
Sprinkle the dry rub generously over all surfaces, pressing it gently into the meat. Let seasoned ribs sit at room temperature for 20-30 minutes.
Set up your smoker for indirect cooking at 225-250°F (107-121°C) with your chosen smoking wood.
Place ribs directly on smoker grates bone-side down with space between each. Insert a leave-in probe thermometer into the thickest part without touching bone.
Smoke undisturbed for 3 hours, maintaining 225-250°F (107-121°C).
Combine apple cider vinegar and beef broth in a spray bottle. Lightly mist ribs with 2-3 sprays every hour for the remainder of the cook.
Continue smoking until internal temperature reaches 195-205°F (91-96°C), typically 6-8 hours total. Probe should slide in with no resistance like warm butter.
If desired, wrap ribs in butcher paper or foil at 165-175°F (74-79°C) to push through the stall and reduce cooking time.
Remove ribs from smoker, wrap or keep wrapped, and rest for 30 minutes to 1 hour.
Slice between bones for individual portions, arrange on a platter, and drizzle with accumulated juices before serving.