Prepare the Ribs and Rub: Start by removing the thin, silvery membrane from the back of each rib rack. Slide a butter knife under the membrane at one end, then grip it with a paper towel and pull it off in one piece. In a small bowl, combine the smoked paprika, brown sugar, garlic powder, onion powder, black pepper, salt, and cayenne. Pat the ribs dry with kitchen paper, then coat them generously all over with the spice rub. You should see the deep red and brown spices clinging to every surface, creating a textured, fragrant crust. Let the ribs sit at room temperature for 30 minutes while your oven preheats to 150°C (300°F).

Slow-Roast the Ribs: Place the seasoned ribs, bone-side down, in a large roasting tin or on a baking tray lined with foil. Pour the beef stock into the bottom of the tin, being careful not to wash the rub off the meat. Cover the tin tightly with a double layer of foil. The aroma that escapes when you seal it is the first hint of the magic to come — a deep, savoury, peppery scent. Roast for 2 hours and 30 minutes to 3 hours, until the meat is tender and has shrunk back from the ends of the bones by about 1–2 cm. A skewer inserted between the bones should slide in with very little resistance.

Make the Glaze: While the ribs roast, make the glaze. In a small saucepan over medium heat, combine the ketchup, apple cider vinegar, Worcestershire sauce, Dijon mustard, and butter. Stir occasionally as the mixture comes to a gentle simmer. You will see the colour deepen from a bright red to a rich, mahogany brown, and the consistency will thicken slightly, coating the back of a spoon. Let it bubble for 5–7 minutes, then remove from the heat.

Glaze and Finish: Carefully remove the ribs from the oven and increase the temperature to 200°C (400°F). Discard the foil and the cooking liquid. Brush a generous layer of the glaze over the top and sides of each rib rack. The first coat will sizzle slightly as it hits the hot meat. Return the ribs to the oven, uncovered, for 10 minutes. Apply a second, thicker coat of glaze and roast for another 10 minutes. The ribs will look sticky and glossy, with the edges of the glaze beginning to caramelise and darken in spots. The kitchen will smell intensely of sweet, smoky barbecue.

Rest and Carve: Remove the ribs from the oven and let them rest on a cutting board for 10–15 minutes. This resting period is crucial; it allows the juices to redistribute evenly throughout the meat, ensuring every bite is moist. Use a sharp knife to cut between the bones, creating individual ribs. The meat should be deeply bronzed, with a slight pull away from the bone, and a clean, glistening cut surface.

Plate and Garnish: For a restaurant-quality presentation, arrange the cut ribs on a large, warmed platter. Drizzle any remaining warm glaze over the top. Finish with a generous scattering of fresh, chopped parsley and sliced spring onions for a pop of green against the dark, glossy meat. The contrast of colours and textures is the final touch that signals this is a dish made with care.