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Basically any country you travel in in Europe or Southern Africa will have a place selling Aussie burgers. Ihad my first one back in 1987 in Greece. Never been to Australia so I can't say for sure they actually eat them there but i have seen them all over the place.
I will probably one of the few that will say this but I think it would be interesting and sounds good to me. I love everything on it. I may try to come up with one and let you know how it tastes.