What are other uses for Vegemite or Marmite besides as a spread? My Australian friend introduced toast with butter and vegemite to me.  Recently I saw an episode of "Chopped" on the food network and one of the ingredients in the basket was Marmite.  One of the chefs used it to flavor ground beef to make a burger or meatloaf.

I want to know what have you guys used Vegemite or Marmite for...other than as a spread.  :)
One good use for it is to amp up the flavor of vegetarian gravy. If you are making say biscuits and gravy, a tablespoon of marmite will add some umami without tasting like soy sauce. Same for a vegetarian pot pie or stew.