Not sure what bratkartoffeln are. Pan fried potatos according to google. I'm not so good a chef that I can make Lasagne unfortunately. We'd have to go back and find Tekky310, the bastard, he's a professional chef.
When Australia gained independence in 1901, the first act of parlimanet was the "White Australia Policy". It basically consisted of a very unfair "test" that non-European people had to pass to migrate to Austrlia. It was designed specifically to make sure that very few of them would get in. There was originally just going to be an outright ban on all non-white immigration, but they decided to go for the stupidly-hard test instead because a blanket ban would have offended Britain's Japanese allies. Shortly after WWII the policy started to be relaxed, and it doesn't exist anymore today. However Immigration is still a hot button issue, usually related to refugee status. Australia gets quite a lot of refugees coming in on boats or planes illegally, and a lot of the public don't want to let them in. Sometimes you might see somebody protesting immigration with signs using the slogan "fuck off, we're full!"
In the 1950's, Australia started promoting immigration from places that weren't the United Kingdom. Although these days we're cool with most of Europe (even the previously hated Italian and Greek immigrants can now band together with British Australians to be racist against Asians, Africans, Arabs etc), this wasn't always the case. The Australian government actually ran advertisements during the 50's and 60's to warm people up to the idea of Norwegian immigrants, because we needed an influx of skilled engineers and other laborers to work on huge hydroelectric projects.
Modern Australia thinks of itself as very multicultural, however it's pretty average regarding ethnic diversity compared to other Western nations. Tasmania in particular is basically the whitest state of Australia, because it hasn't been a popular destination for migrants and there are no "full-blooded" Tasmanian natives left.