Prep the ribs: Pat the ribs dry. If there’s a silver skin membrane on the bone side, slide a butter knife under it and pull it off with a paper towel for grip.
Bind and rub: Rub the ribs with olive oil and a thin layer of mustard. Mix the dry rub and coat the ribs on all sides.
Press it in so it sticks.
Rest the rub: Let the seasoned ribs sit at room temperature for 20–30 minutes while you heat the oven to 300°F (150°C) or preheat your grill for indirect heat at the same temp.
Set up the pan: Place ribs bone-side down on a rimmed baking sheet or in a roasting pan. Pour beef broth or water into the pan (not on the ribs). Cover tightly with foil.
Slow-cook: Bake for 2.5–3 hours (or grill over indirect heat with the lid closed) until the meat is tender and pulls back from the bones by about 1/2 inch.
Make the glaze: In a small bowl, whisk the BBQ sauce, brown sugar, vinegar, Worcestershire, and smoked paprika.
Warm it briefly on the stove or microwave to dissolve the sugar.
Glaze and finish: Remove foil. Brush ribs generously with the glaze. Return to the oven uncovered for 15–20 minutes at 375°F (190°C) or move ribs over direct heat on the grill for 5–8 minutes, flipping and glazing until sticky and caramelized.
Rest and slice: Let the ribs rest 10 minutes.
Slice between the bones. Serve extra glaze on the side.