MasterChef judge Jock Zonfrillo roasted by Heston Blumenthal

They might be good pals but there was no love lost between MasterChef judge Jock Zonfrillo and superstar chef Heston Blumenthal when he made a guest appearance in tonight's episode.

In a sneak peek clip shared with Yahoo Lifestyle, larger-than-life Heston greets the contestants via video call then wastes no time in roasting his mate Jock's wardrobe choices.

"I have to say, when did you turn into a Scottish lord?" he quizzed a stunned Jock who was sporting a navy three-piece suit with a subtle plaid print.

"You dress like somebody that should be hunting pheasant," he added to laughter from the contestants and Jock's fellow judges, Melissa Leong and Andy Allen.

Not one to let the dig slide, Jock called Heston out on his own salubrious circumstances.

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"Says the guy who is dialing in from the south of France in a chateau!" he quips.

With the friendly banter over, it was time for Heston to set the contestants a very 'Heston' challenge: turn a breakfast dish into dessert.

Think bacon and egg ice cream, a vegemite dessert and more as 'Superstars Week' wraps up on the hit cooking show.

Watch MasterChef 7.30pm tonight on 10 and 10play.

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