Add the water and apple cider vinegar to your Instant Pot. 

Place a trivet down inside your Instant Pot (we used our 8-quart Instant Pot for this recipe).

Now mix together the ingredients for your dry rub: brown sugar, onion powder, cumin, chili powder, and ground black pepper.

Rinse the ribs and pat dry.

Remove the membrane from the back of the ribs; you can do this by using a knife to scrape up the edge, grab it with a paper towel, and pull it back.

Sprinkle and rub the rib rub all over both sides of the ribs, making sure every inch is covered with flavor.

Slightly fold the ribs and place them in a semi-circle on top of the trivet inside the Instant Pot.

Place the lid on your pressure cooker, and make sure the vent is sealed.

Press 'Pressure Cook' and set for 25 minutes. 

Once the Instant Pot is done cooking, allow it to naturally release before opening it up.

Pre-heat the broiler on your oven to 'High'.

When the ribs are completely cooked, carefully remove them from the Instant Pot and place them on a cookie sheet.

Brush BBQ sauce all over the ribs, on both sides.

Place in the oven to broil for 3 to 5 minutes. 

Remove from the oven and serve immediately.