"It was the customer service team that actually sold all this," Mr Marriot said, and Mrs Shannahan agreed.
"I've got a good team."
For his part, Mr Marriot has contributed the Kiwi Breakfast, a dish inspired by his time as an airline chef.
The dish features a potato rosti stack infused with baked beans, with foccacia bread, poached eggs and hollandaise sauce.
The stack is so arranged on the plate that "in theory when you bite into it, you can have a bit of everything".
Mr Shannahan is so happy with the dish, he has decided to keep serving it up as the Tararua Breakfast once the competition is over.
Judges nationwide are now set to descend on the finalists and assess each cafe on the competition dish and other criteria.
They include access, atmosphere, appeal and staff attitude, the meal including customer care and quality of food and coffee, closing and payment and the overall cafe experience.