"overcook" news and stories

Without naming any names, some cultures have a tradition of overcooking vegetables almost to the point of mush. If you had a grandmother or a great grandmother who liked to prepare vegetables in this way, you are probably familiar with one of the least pleasant smells that the kitchen has to offer: overcooked cabbage. When overcooked, cabbage tends to emit a faint (or strong, depending on how much cabbage is being cooked) smell of sulfur. To cope, the usual strategy is to turn on a fan or open the windows, but this week I heard about a different technique. Apparently, if you add a whole, unshelled walnut or a celery stalk to the cooking water, there will be no smell.

I don't cook enough cabbage to test this - and certainly try to avoid overcooking it, in any case - but does this actually work, or is it just an old wives' tale?