Hazard alert: If you're dropping onions for others to slip on, you're doing it wrong.

Bad news for sausage sizzlers: You might have been doing it wrong all this time.

For health and safety reasons, those assembling a fundraising snack in a Bunnings carpark can no longer layer the sausage on the bread, then the onion, with sauce on top.

Instead, those hawking barbecued sausages must now put the onion between the bread and sausage.

"Safety is always our number one priority and we recently introduced a suggestion that onion be placed underneath sausages to help prevent the onion from falling out and creating a slipping hazard," said Debbie Poole, Bunnings chief operating officer.

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"This recommendation is provided to the community groups within their fundraising sausage sizzle welcome pack and is on display within the gazebos when barbecues are under way.

"Regardless of how you like your onion and snag, we are confident this new serving suggestion will not impact the delicious taste or great feeling you get when supporting your local community group."

The recommendation will apply in Australia and New Zealand.

I want to know which single person slipped on an onion at Bunnings and ruined it for everyone. #bunnings #oniongate — Ben Shute (@Ben_Shute) November 13, 2018

A spokeswoman said it was not a rule but a serving suggestion "to help keep everyone safe".

Social media users were perplexed by the change.

"Soon we'll all have to wear high-vis vests in the Bunnings carpark," said one on Twitter.

"Bunnings sell bubble wrap, right? Let's go buy rolls of this to cover ourselves with," wrote another.