Add sugar mixture to steam-jacketed kettle or double-boiler. Stir in egg mixture. Cook and stir over medium heat, until mixture thickens and boils. Remove from heat; stir in vanilla. Portion into heat-proof dishes; refrigerate. To serve, sprinkle and smooth 1 tablespoon brown sugar over each custard. Blow torch or broil custard at least 5 inches from heat source for 2-5 minutes, just until caramelized.