When meat pies attack and what is Vegemite anyway?

As the subject indicates this post has something to do with food in Australia. In particular it has everything to do with foods that are typically Australian (with some British influences). The foods I got to try that fit this description include:

• Vegemite
  This is yeast extract. Sounds weird. It's full of B vitamins, though. Kind of salty and an aquired taste but good on toast or crumpets. Beware on Crumpets it sticks in the holes so use sparingly.
• Yabbies
  Giant crawdads/creyfish. Good cooked like you would any seafood. Some get a foot long.
• Prawns
  Shrimp of gigantic proportions. These are excellent and can be found all over Australia.
• Morton Bay Bugs
  A crustacean found only in Morton Bay near Brisbane. Tastes like lobster and is great grilled.
• Fish and Chips with potato cakes
  Oily but good. I had this twice. I think the potato cake might be peculiar to Australia. It seems like a slice of a large potato breaded and fried. The fish is sometimes shark or other white fish. Light, mild and good. Served with malt vinegar over all.
• Crumpets
  A yeast based fried bread. Toasted before eating and usually served with butter and some sort of fruit spread. Also good with Vegemite.
• Donuts (not your typical USA donut)
  Lighter with a more delicate flavor than in the USA. Very good. There is also a filled variety but those were sold out the day we were at the Queen Vic market.
• Meat Pies and Meat Rolls
  Flakey pastery/pie crust made into small pies or rolls with a meat filling. The pies have a small hole in the top which often has Tomato Sauce squirted in it. Be sure to support the bottom of the pie at all times. They have a tendency to go blop when the bottom crust collapsed. Mine did this after only a couple of bites and I ended up wearing it on white slacks. The rolls are much safer eating.
• Tomato Sauce (it's not Catsup, it's not tomato sauce as we know it)
  It a little thinner than Catsup but not as thin as Tomato Sauce. It is spiced but not sure with what. I thought it tasted similar to Catsup until I had it side by side with Catsup. It's not as invasive as Catsup but is used as a condiment.
• Pawpaw
  An interesting fruit that is about the size of a cantelope and has a flesh similar in look and taste to that of a mango. Use like mangos. I had mine on cereal cute in cubes.