While the oven is preheating, prepare the beef back ribs by removing the membrane on the back of the ribs. Pry up a corner of the membrane with a butter knife, then use a paper towel to grip the membrane and peel it off the ribs.
Evenly coat the ribs with yellow mustard to serve as a binder to help the seasoning stick, and build a nice crust on the ribs.
Combine the sea salt, black pepper, paprika, and garlic into a shaker bottle to make the smoked seasoning blend; generously season the ribs. Allow the ribs to rest, letting the seasoning sweat into the meat for 20 minutes.
Wrap the dry rubbed ribs tightly in two layers of heavy duty aluminum foil.
Place the ribs on a wire cooling rack, inside a raised edge baking sheet. The raised edge baking sheet collects any juices that may leak out of the foil.
Put them in the oven and bake the beef ribs for 2.5 hours. While the ribs are baking, combine all ingredients for the barbecue sauce in a medium saucepan. Place over medium low heat for 30 minutes. Whisk occasionally and allow the sauce to reduce slightly.
Remove ribs from the oven, and take them out of the foil, placing them back on the wire rack on the baking sheet. Turn the oven on broil.
Lightly glaze the ribs with the barbecue sauce, and return them to the middle rack of the oven for four minutes. This will allow the sauce to get tacky and caramelize slightly.
Remove ribs from the oven, and allow them to rest for five to ten minutes before slicing and serving.