Adam Liaw winning MasterChef Australia season two in 2010 was the most-watched television moment of the decade.

More than four million metro viewers watched Adam's victory over runner-up Callum Haan, according to industry website TV Tonight.

The national audience, including regional viewers, was 5.29 million - approximately one in four Australians at the time.

Winners are grinners! Adam Liaw winning MasterChef Australia season two in 2010 was the most-watched television moment of the decade

When Adam won MasterChef Australia, he earned himself a $100,000 cash prize and a publishing deal.

Since then, the 41-year-old has written five cookbooks, worked as a food columnist and fronted the AACTA Award-winning TV show Destination Flavour.

Reflecting on his victory, Adam said he couldn't believe how quickly his life changed after the finale.

Major moment: More than four million metro viewers watched Adam's victory over runner-up Callum Haan, according to industry website TV Tonight

'The filming period was very long with strict lockdown and media blackout conditions, so we'd been in relative isolation for months,' he told TV Tonight.

'We were dropped back into a situation where there was a lot of public attention. It was quite overwhelming to go from extreme solitude to extreme exposure literally overnight.

'The winner announcement was shot on the day [of the finale] at around 4pm and the entire set was in lockdown for about six hours until the result finally went to air.'

Claim to fame: When Adam won MasterChef Australia, he earned himself a $100,000 cash prize and a publishing deal

Reality TV and sport were popular in the 2010s, with only one drama show - the first episode of Underbelly: Razor - making it into the top 30 most-popular broadcasts.

The Block season four's winner announcement came in third place, behind MasterChef Australia's season two finale. (The whole episode and Adam's winner announcement counted for two separate positions in TV Tonight's ranking.)

The 2010 AFL Grand Final came in fourth place, while Karise Eden winning the first season of The Voice Australia in 2012 came fifth.

Remember them? The Block season four's winner announcement came in third place, behind MasterChef Australia's season two finale. Pictured: The Block's Polly and Waz Jones

Throwback! The 2010 AFL Grand Final came in fourth place, while Karise Eden (pictured) winning the first season of The Voice Australia in 2012 came fifth

Overall TV viewership has plummeted in the last few years, with no shows from 2018 or 2019 making TV Tonight's top 30.

TV Tonight's rankings do not include major televised events that aired across several networks, however.

Prince William and Kate Middleton's 2011 wedding had a total viewership of six million, while the wedding of Prince Harry and Meghan Markle drew four million in 2018.