Just before serving, sprinkle top of custard layer evenly with 1/3 cup sugar. Holding kitchen torch 3 to 4 inches from custard, caramelize sugar on custard by heating with torch about 2 minutes, moving flame continuously over sugar in circular motion. The sugar is partially melted at this point. Keep moving flame continuously over sugar in circular motion until sugar is melted and light golden brown. Let stand at room temperature about 1 minute or until caramelized sugar hardens before cutting into bars. Cut into 6 rows by 4 rows.