Prep ribs: Preheat oven to 275°F (135°C) for oven method. Remove membrane from the bone side and pat ribs dry.
Oil & rub: Rub ribs lightly with olive oil. Mix the dry rub in a bowl and massage evenly over both sides. Let rest at room temperature 15–20 minutes or refrigerate overnight for deeper flavor.
Make glaze: In a small pan, combine sugar-free ketchup, vinegar, sweetener, liquid smoke, and Worcestershire. Heat gently for 3–5 minutes until slightly thickened. Cool.
Bake low & slow: Place ribs bone-side down on a rimmed sheet and tent with foil. Bake at 275°F for 2½–3 hours until meat is tender. (If using a smoker, smoke at 225°F for 3–4 hours, spritzing as needed.)
Glaze & finish: Remove foil, brush ribs with glaze, and either broil 2–4 minutes or bake at 425°F for 8–10 minutes to set glaze and caramelize—watch closely to avoid burning.
Rest & serve: Rest 5–10 minutes, slice between bones, and serve with extra glaze on the side.