An Australian cafe is claiming a world record after cooking a giant hamburger with an 81kg patty that took 12 hours to cook and four men to flip.

The monster burger cooked up by Sydney cafe owners Joe and Iman El-Ajouz, weighed in at 90kg in total, eclipsing the previous record of 84kg, set in Michigan in the United States.

"Just flipping the patty was the main challenge for us, but it all went well," said Iman El-Ajouz.

The burger also contained 120 eggs, 150 slices of cheese, 1.5 kg of beetroot, 2.5 kg of tomatoes and almost 2 kg of lettuce all topped off with a special sauce.