The side-sealed shape of a Cornish Pasty helps contain the juices
http://wiki.saomaitech.vn/index.php/Cornish_Pasties_by_Post:_A_Guide_to_the_Cornish_Pasty%E2%80%99s_Official_Status_21396
The side-sealed shape of a Cornish Pasty helps contain the juices, preserving the moist texture that makes the filling so satisfying.