"Last year we won the bronze medal, so there's been a huge improvement since then," Charlotte said.
Charlotte and Matt also recently won silver at the Beef and Lamb competition in Auckland.
Both students are Year 13, which means they will be leaving school at the end of the year. Charlotte intends to take up her scholarship so she can become a chef; while Matt said it was one of a number of options he's considering.
"We're also thinking about who we can help train up before we leave, so there's a team for next year," Matt said.
They paid tribute to their teacher, Linda Hardcastle, and their mentor, Dean Wong, both of whom have spent many hours working with the pair.
Ms Hardcastle said she was delighted by her students' win.
"I'm very, very proud of them. They faced intense competition but did extremely well."
Charlotte and Matt also wanted to acknowledge Wanganui Produce, which supplied some of the food free of charge.