While salty and sweet often complement one another, the lamington burger has left locals baffled.
"Are these cream-filled lamingtons or plain? Just trying to work out how many extra cholesterol tablets I'd need to take," one person said.
Another joked: "I don't know how drunk I'd need to be to eat one of these. But ill be past the point by 2pm on the day."
One wrote "you can't do this to bacon - it's just wrong" while another claimed it had "absolutely no structural integrity whatsoever, this would be a red-hot disaster to eat".
"This is offensive on 36 different levels ... They've ruined two meals here."
Despite the backlash, a number of fans came to the defence of Chuck Wagon 175, with a number claiming the food mashup is a great idea.
"100% better than Smith's lamington chips. We couldn't even give them away at work," one wrote.
Another said: "Australian equivalent of chicken and waffles!"
Australia Day is on Sunday, January 26.