He is usually full of laughs when he sits behind the anchor desk on Channel Nine's Today show.

But Karl Stefanovic was nearly reduced to tears on Tuesday when he was forced to eat lamb kidney while blindfolded during a taste testing stunt with The Hotplate's judge Scott Pickett.

'That's disgusting mate,' the 40-year-old repeatedly said as he turned his back to the camera to focus on eliminating the strong flavour within his mouth.

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New things: Karl Stefanovic walked off the set of the Today show on Tuesday when he ate a lamb kidney while blind folded during a taste testing stunt with The Hotplate's Scott Pickett

Refusing to re-join his co-host Lisa Wilkinson in front of the food trolley, Karl ripped his goggles off as his face began to go red while he pushed Scott away.

'Nah I'm not doing it anymore. I don't even think this is funny,' he said as he bent over his knees placing his head low towards the ground.

The funnyman’s reaction to the kidney came as a surprise to Scott, who soon gave up trying to get him to return to the challenge.

No jokes here: The 40-year-old reacted to the taste badly as he repeatedly stated 'That's disgusting mate' to Scott and Lisa

No return: The host turned his back to the camera to focus on eliminating the strong flavour within his mouth

The after effect: His face started to go red as he struggled to keep the kidney down while walking off set

And he's off: Karl refused to re-join his co-host Lisa Wilkinson in front of the food trolley for the second and third round

'Karl didn't take that very well,' Scott said with a shocked tone in his voice.

But while Karl walked off set to hide behind the cameras, Lisa took one for the team battling her way through the second and third round which included sheep's brain and chicken's heart.

Keeping her blacked-out goggles on, the 55-year-old forced herself to continue despite nearly being sick at the smell of the different foods.

'I'm going to have bad breathe all day...That stinks,' she said as she desperately requested a glass of water.

Stepping up: Lisa took one for the team and battled her way through the second round which included sheep's brain (pictured)

The final dish: The 55-year-old also needed to eat a chicken's heart during the third stage of the challenge

A breather: Lisa demanded a glass of water following the task because of the bad after taste the dishes left

Struggles: Despite finding it hard to eat the three dishes, Lisa hit out at Karl for backing out of the challenge before revealing the experience was 'really bad'

'Can I please have a glass of water please? It's really bad,' she pleaded.

After completing all three rounds successfully Lisa hit out at her co-host for backing out of the challenge before revealing just how horrific the experience was.

'He is hopeless,' she said before telling the reality TV judge Scott that the taste testing was 'pretty bad'.

'When you are a judge on The Hotplate these are the things you have to sometimes try, even if you don't want to,' Scott replied to Lisa.