Preheat the oven to 350°F
Add the Cajun seasoning, 1 tablespoon brown sugar, and the soy sauce to a small bowl. Mix well using a fork, set aside.
Cut two pieces of aluminum foil about 28-30 inches each.
Line a large baking sheet with the foil. Place one piece vertically and place the second piece horizontally (running the length of the pan).
Place the ribs in the center and rub the prepared Cajun seasoning mixture on the bottom and sides. Place the ribs meaty side up and rub generously with the mix.
Fold in the sides to loosely cover the ends of the rib slab. Bring up the sides but don’t press them to the ribs, so it resembles a tray.
Next, bring up the vertical piece of foil and fold a couple of times to make a packet. Loosely bring in or fold any pieces of foil to finish making the packet. Don’t wrap the ribs too tight, seal the packet but leave room for air.
Bake the ribs for 2 hours.
When the ribs are almost done, prepare the sauce. Add the barbecue sauce, ¼ cup brown sugar, honey, ketchup, mustard, and Worcestershire sauce to a medium saucepan.
Gently heat the sauce over medium heat. Stir frequently, almost constantly, to avoid sticking and burning.
When the sauce comes to a simmer lower the heat to low and continue warming and stirring until the sugar melts and the ingredients are combined. Keep the sauce warm until ready to glaze, stir occasionally.
Reserve about ⅓ of the sauce for serving.
Remove the ribs from the oven, carefully open the foil (there will be steam accumulated) and fold it down so that the ribs remain uncovered.
Carefully turn the ribs (they will be very tender) so that the underside is up. Brush or spoon about a ⅓ of the barbecue sauce on the ribs.
Place the baking sheet back in the oven and bake for 15 minutes.
Remove the ribs from the oven, carefully turn them so they are meaty side up. brush with half the remaining sauce. Bake for 10 minutes.
Brush them one more time with the remaining sauce. Bake another 10 minutes.
Place them on a cutting board or platter, if desired. Serve the ribs with the reserved sauce and enjoy.