1 tablespoon brown sugar
2 teaspoons kosher salt
2 teaspoons onion powder
2 teaspoons chili powder
2 teaspoons ground mustard
1 1/2 teaspoons smoked paprika
1 teaspoon dried thyme
1 teaspoon dried oregano
1 teaspoon garlic powder
1 teaspoon freshly ground black pepper
3/4 teaspoon ground cumin
1/2 teaspoon cayenne pepper
2 (2-pound) racks baby back pork ribs, trimmed of excess fat, rinsed, and patted dry
2 cups chicken stock
1/2 cup apple cider vinegar
2 cups barbecue sauce
Prepare the Rub:
In a small bowl, combine the brown sugar, salt, onion powder, chili powder, mustard, paprika, thyme, oregano, garlic powder, black pepper, cumin and cayenne pepper.
Apply the Rub:
Remove the membrane from the underside of the ribs, pulling it down the entire length. Season ribs with brown sugar mixture, rubbing in thoroughly on both sides.
Pressure Cook the Ribs:
Add chicken stock and apple cider vinegar to a 6-qt Instant Pot®. Place the metal trivet into the pot. Then, place the ribs upright on top of the trivet, wrapping them in a circle.
Select Manual setting; adjust the pressure to high, and set the time for 20-25 minutes.
When finished cooking, quick-release the pressure.
Preheat the oven to broil and line a baking sheet with foil.
Place the ribs, meat side up, in a single layer onto the prepared baking sheet. Brush them with barbecue sauce.
Place the baking sheet into oven and broil until the barbecue sauce is caramelized and browned, about 4-6 minutes.
Serve immediately with the remaining barbecue sauce.