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Sixteen-year-olds Casey Broad, Gina Manning and Declan Smith beat pupils from Garin College (Nelson) in the televised semifinal at the weekend.
The Dunedin pupils have appeared in several heats of the show, which is designed to inspire New Zealand families to make healthy diet choices and enjoy exercise.
Pupils from 16 secondary schools around New Zealand participate in a mix of cooking, interactive questions, silly challenges, sketch comedy and physical competition.
Each team is given a base recipe for a dish, but it can use its creative, nutritional input to impress the judges.
The trio impressed the judges with their kebabs by making their own marinade using low sodium tomato sauce, balsamic vinegar, garam masala, paprika and thyme, which reduced the sodium content.
Casey said the team was delighted to reach the final. She said she was the only one of the three who studied food technology.
The final is on TV2 on May 17.