Prep the ribs and pat them dry with paper towels. This helps the seasoning stick and gives the ribs better texture as they bake.
Flip the ribs bone-side up and remove the thin membrane from the back. Slide a small knife underneath to loosen it, then use a paper towel to grip and pull it off.
Lightly coat both sides of the ribs with mustard. Sprinkle evenly with salt, black pepper, coriander, garlic powder, and paprika, then gently rub the seasoning into the meat.
Wrap the ribs tightly with parchment paper and foil. Bake at 300°F (150°C) until the meat is tender and pulls easily from the bone.
While the ribs bake, make the barbecue sauce. Combine ketchup, soy sauce, brown sugar, and smoked paprika in a small saucepan. Simmer for about 5 minutes, stirring, until slightly thickened.
Remove the ribs from the oven and carefully unwrap them. Brush the ribs generously with the barbecue sauce.
Increase the oven temperature to 400°F (200°C). Return the ribs to the oven, uncovered, and bake until the sauce becomes sticky and lightly caramelized.
Let the ribs rest for about 10 minutes before slicing. This keeps them juicy and tender.
Serve warm and enjoy.