The fastest eaters of Pronto's Challenge Burger looked like they bit of more than they could chew when taking on Kiwi model and competitive eater Nela Zisser who blitzed the current record by half.

Pronto's fastest eaters of the Challenge Burger couldn't beat Kiwi model Nela Zisser, who finished the massive meal in three minutes and 40 seconds. Photos and video by: Cameron Avery.

At the Mount Maunganui burger bar on Saturday afternoon, Nela guzzled down roughly 1kg of hamburger in just three minutes and 40 seconds. The fastest someone has consumed the burger before her was six minutes and 49 seconds.

'I've never actually eaten the burger before, so I didn't know what time I was going to do it in,” says the model, wiping her face after the competition.

Pronto's Challenge Burger is made of three 175g beef patties, two eggs, two hash browns, bacon, cheese and three bread buns, topped with two onion rings and served with fries.

The big burger has become the subject of an eating competition to see how fast the patrons can eat it. The longest it's taken someone to complete the burger challenge is one hour, seven minutes.

More than 150 burger lovers have lined up to complete the challenge so far, with only 60 people finishing it all.

On Saturday, the top 10 fastest eaters of the Challenge Burger were invited to take on Nela in wolfing down the massive meal.

The former Miss Earth New Zealand is known for her big appetite after eating a 2.3kg burrito in less than five minutes and 100 pieces of sushi in under nine minutes.

She also recently competed at the world-famous Nathan's Hot Dog Eating Contest in New York.

Kiwi model Nela Zisser.