"Everyone knows us for our French pastries, but this year we wanted to add something more," she said.
The recipe for the tart came from Maria's husband Daniel Putz, who is a chef, and both were a little surprised when the winning dish was announced.
"We knew that most of the participants would have produced some amazingly rich multi-layered cakes with cream and everything else you could imagine," Maria said.
"We never guessed that our simple lemon tart could ever have a chance of winning. We just never saw that coming."
The prize for winning the annual competition, which is beloved by the community, is a hand-made wooden medallion that will take pride of place in the cafe, along with a cookbook, a restaurant voucher and a voucher for a chocolatier in Kerikeri, all of which Maria was keen to share with her team, who are more than just workmates.
"I'm very happy to be part of the French Cafe. For me the ladies there are not only colleagues, they are part of my whanau," she added. "Coming from so far away in Peru and Italy, it was difficult to feel at home here initially. I'm quite blessed to have found them, and we provide support for each other."