Chop the vegetables and drain the corn. Place all veg into a medium sized bowl.
Mix the marinade ingredients in a smaller bowl. Heat the marinade by microwaving for 1 minute on high. Make sure that the sugar dissolves. Heat again for 15 seconds and stir if sugar doesn't dissolve readily.
Pour hot mixture over the corn/veg in the larger bowl. Stir it up. Stir every 5 min or so till cool. (15 min) Keep in fridge covered - for up to 5 days or a week.