In the video The Unconventional Oven released by Kidsafe Australia, the chef does a cooking demonstration on Bondi beach but onlookers aren't aware that he left a lamb loin on a tray in a nearby car.

With the temperature in the car starting at 27.1 degrees, the lamb gradually starts browning and oozing fat.

The image will turn your stomach and is a real eye-opener about the danger of soaring heat. When it's 72.5 degrees inside after 90 minutes, the meat is cooked through. In the unconventional cooking demonstration, Moran prepares a plate with harissa and a pine-nut dressing, then surprises onlookers when he walks to the car.

He removes the tray and says: "To me, that is overcooked." And he adds: "The real reason I've got you here today has got nothing to do with me launching my oven.

"It's all to do with over 5000 kids being left in cars every year."

"Australia needs to know that it is not safe to leave a kid in a car, the chef says. "It is like an oven!"

The video is a timely warning for parents as summer begins.

Despite continual warnings about leaving children in cars, some parents have not got the message. Even opening the window makes little difference to the internal temperature.

During the peak of summer in February this year, Ambulance Victoria responded to more than 200 calls. In the previous year, paramedics were called to 1165 cases of children left unattended.

Kidsafe spokeswoman Kellie Wilson said the temperature inside a car could be 30 degrees hotter than outside. Most of the children rescued were aged under four.

Ms Wilson recommended a "look before you leave" routine to ensure children were not left behind.

For more tips on keeping children safe during summer, go to Kidsafe Victoria.