Leave them alone and permit them to simmer in their very own juices
. For your last touch you are going to drain the braising liquid into a saucepan and heat it till it is lowered by about 1/2 and thick enough to glaze onto the ribs. Glaze the ribs with the reduced sauce and position the ribs below the broiler. This last action of slow cooking baby back ribs in the oven is what provides them the caramelization.