Kasey, 23, and Karena Bird, 25, take home $100,000 worth of prizes, including two cars, kitchen appliances, kitchenware and groceries, as well as the exclusive cookbook deal.
Ms Bird said the sisters' passion for food and cooking had developed later in life.
"In the last couple of years we have taken it a bit more seriously and been a bit more experimental so it comes from eating out and trying to recreate the same dishes at home."
Being this year's winners was overwhelming for the two young women, she said.
"We feel it is such a huge accomplishment and we feel really proud for what we have managed to do."
Ms Bird said one of the most challenging aspects of the show was the constant stress surrounding the filming. "You are not allowed to go anywhere, it's quite full on, and living with 29 other people."
Since the show finished last year the winners have been doing work experience based at Elizabeth Cafe and Larder in Tauranga with various other trips to foodie places in other parts of New Zealand.