Step 1

Combine water, vinegar, and liquid smoke in the pot of a multi-functional pressure cooker (such as Instant Pot®). Place rack in the bottom of the pot.

Step 2

Season baby back pork ribs with salt and pepper on both sides. Cut rack in half. Place ribs in a teepee formation onto the rack. Pour a little barbeque sauce onto each half and let run down the sides. Close and lock the lid.

Step 3

Select Meat setting according to manufacturer's instructions; set timer for 30 minutes. Allow 10 to 15 minutes for pressure to build.

Step 4

Wait 15 minutes before releasing pressure carefully using the quick-release method according to manufacturer's instructions, about 5 minutes. Unlock and remove the lid.

Step 5

Set an oven rack about 6 inches from the heat source and preheat the oven's broiler. Line a baking pan with aluminum foil. Place ribs onto the prepared baking pan and slather with barbeque sauce.

Step 6

Cook under the broiler for 5 minutes. Remove and immediately add more sauce.