Prepare the ribs: Coil the racks of ribs so they fit inside the Instant Pot, lining them against the pot’s perimeter. A 6-quart Instant Pot fits 2 racks, while an 8-quart model accommodates 3 racks. If preferred, cut the racks in half for easier handling.
Add the cooking liquid: Pour in the apple juice, apple cider vinegar, and liquid smoke to infuse the meat with flavor.
Pressure cook the ribs: Secure the lid, set the valve to “Sealing,” and cook on Manual/Pressure Cook – High Pressure for:30 minutes for 5–6 pounds (1.5–2 racks)25 minutes for 2–4 pounds (1 rack)For firmer ribs: Reduce cook time to 23 minutes for 5–6 pounds, or 18 minutes for 2–4 pounds.The Instant Pot may take 20 minutes to reach pressure. Release pressure: Allow a 5-minute natural release, then perform a quick release. If splattering occurs, place a dish towel over the release nozzle. For even more tenderness, let the pressure release naturally.
Remove the ribs carefully: Once cooked, use tongs to gently transfer the ribs to a foil-lined baking sheet (bone side down). The ribs will be very tender, so handle them delicately to avoid breaking.
Apply barbecue sauce: Generously brush barbecue sauce over the ribs, ensuring they are well-coated.
Caramelize in the oven (optional): Preheat your oven to 400°F (200°C). Place the sauced ribs on a foil-lined baking sheet and bake for 10 minutes, allowing the sauce to thicken and caramelize onto the meat.
Serve and enjoy: Remove from the oven, slice the ribs, and serve with extra barbecue sauce. Have plenty of napkins ready!