Season the ribs with salt, pepper, garlic powder, and smoked paprika.
Return the ribs to the oven to cook for an additional 3½ hours at 300 degrees.
Slather the tops of the ribs with the tomato paste and sprinkle with brown sugar.
Return the ribs to the oven and roast for an additional 40 minutes, or until the ribs reach an internal temperature of 190-degrees on a meat thermometer.
To prepare these baby back ribs on the outdoor BBQ, preheat the grill to medium heat.
*Note - If flair-ups occur, reconfigure the ribs slightly so they're not directly over the open flames, and have a squirt bottle filled with water at the ready.
*Note - placing two bricks on the grill grates at this point is a great way to turn the outdoor grill into an outdoor oven. By placing the baking sheet on top of the bricks it is a great way to turn your outdoor grill into an outdoor oven. (optional)
Tools and equipment needed:
Baking sheets, paper towels, paring knife, basting brush, measuring spoons, aluminum foil