A furious woman is threatening a French café with legal action after learning the popular Sunshine Coast business doesn't serve macarons.

Owners of the café, La Maison du Patisser, have been left in shock after the irate customer filed a complaint with the Office of Fair Trading.

The woman argues it's false advertising to be a French café and not sell the traditional treat.

Eric and Francoise Pernoud opened the popular Sunshine Coast business last month. (Facebook) (Nine)

Eric and Francoise Pernoud, who opened the café a month ago, think the legal action is ridiculous and strongly defend their decision not to serve macaroons.

"You can find macarons everywhere now," Mr Pernoud told 9NEWS.

"I thought with a new business, new beginnings. I just spent three months in France and macarons are going out of fashion over there."

Mr Pernoud was left shocked after he learned an official complaint had been filed against them. (9NEWS) (Nine)

Ms Pernoud said macaroons also don't fare well in the Queensland humidity, which played a role in the decision to leave them off the menu.

"Imagine buying a box of macarons at 11am before lunch and you go home and at 6pm it's all crumbing," Ms Pernoud said.

9NEWS has contacted the woman threatening legal action but has not received a response.

The owners of the trendy cafe took to Facebook to tell their customers they'd been hit with the treat of legal action. (Facebook) (Nine)

The owners say the Queensland humidity would not fare well for the French treat. (File) (Nine)

The couple took to their Facebook page yesterday telling their customers they were under the threat of legal action, which sparked a strong response.

Many are furious the small business owners are being forced to defend themselves in this "ridiculous" situation.

"Surely this isn't for real," one Facebook user commented.

The couple has blasted the potential legal action as ridiculous. (Facebook) (Nine)

"Let them sue you, it's free publicity, you are going to be twice as busy and people are going to be driving from all over to come and eat your beautiful French food," another said.

Earlier this week, a Sydney barber was left devastated after being taken the Human Rights and Equal Opportunity Commission for not cutting a young girl's hair.