She joined Masterchef New Zealand judge and Auckland celebrity chef Simon Gault for filming in May of a special 90-minute MasterChef Australia episode, both showing off their expertise, along with New Zealand's extensive food and wine experiences.
The episode will screen in Australia on July 1, on a programme that attracts the largest audience next to major sporting events.
Scenes were shot in Moeraki and Fleur's Place and the Oamaru historic precinct and her Loan and Mercantile restaurant before she went to Australia, to complete the segment.
Ms Sullivan said the segment was part of the master class for contestants.
She wanted to prepare her groper and green lipped mussels dish but, because it was winter, the show's organisers decided on her seafood chowder.
"We prepare 125 litres of fish stock a week [at Fleur's Place], so I wanted something else. But they loved the seafood chowder - it all went," she said on Friday.
Ms Sullivan wanted to take fresh New Zealand shellfish, including mussels, for the dish and vacuum-packed it.
"I declared it at Customs, but the Australians took it off me. I had to use the ingredients provided by the show," she said.
Ms Sullivan said she had never watched MasterChef - "I see that in my kitchen seven days a week" - so she does not know what to expect when her part screens on July 1.
However, she hoped she had enough time to promote Otago, its beauty, food and wine.
Tourism New Zealand helped bring the show to New Zealand by hosting the MasterChef contestants and crew in May for almost a week. Tourism Waitaki hosted the film crew in Waitaki for two days.
Tourism Waitaki general manager Annabel Berry said having Masterchef in Waitaki would provide major benefits for the whole of the Otago region, through showcasing its food, wine and landscapes to the Australian market.
"Fleur is a real icon within our cuisine industry, by providing fresh produce that she finds right on her doorstep. That is a great New Zealand story," she said.
Tourism New Zealand general manager brand and international public relations Catherine Bates said having the hit Channel 10 show film an episode in New Zealand would boost New Zealand's profile as a destination for great food and wine in Australia.
"The enormous exposure in our most important visitor market offers tremendous opportunity to showcase what New Zealand has to offer in the way of great culinary experiences," she said.
To coincide with the airing of the episode, Tourism New Zealand is running a range of television and digital promotions with extensive social media and public relations activity in Australia to promote New Zealand food and wine.
