The “life-changing” technique of a cookbook author and nutritionist to quickly dice an onion has taken off, with users praising the ingenuity.

From My Little Kitchen, Melanie Lionello of Melbourne, Australia, shared her method on Instagram and TikTok, writing: “I was today years old when I learned that I could dice an onion like this. Please tell me that I’m not the only one.”

Lionello, in the video — which has been seen more than 4.5 million times on TikTok and liked by more than 700,000 people on Instagram — takes an onion whose peel and stem have been removed so that one end is flat. She lays the onion onto a cutting board with the root side up.

She cuts the entire onion into vertical pieces, starting at the ground and working her way up to the chopping board.

Finally, she turns the vegetable upside down and vertically chops it again. The end product is a fully diced red onion.

“This hack is going to save so many tears,” she said on Instagram.

The “genius” time-saving method was hailed by TikTok users.

“Omg 57 years of onion tears for this lol,” one said.

“That’s not even fair,” another person wrote.

“I’ve learned more on TikTok than I have at school,” another stated.

However, some wannabe food critics thought her approach unsanitary and simple.

“Good Lord, cut it in half first,” one said.

“Cut it in half so it’s [more] flat on the cutting board, otherwise you risk the onion rolling. This, as shown, is dangerous,” another person commented.

“Didn’t know there was another way,” another said.

TikTok has become a mecca for life hacks, with many videos demonstrating how to make routine activities easier. Food is one of the most popular subjects on the site, particularly eggs.