She was motivated to enter the nationwide competition by her teenage son Todd who, as an avid hunter, kept the family's freezer full of duck.
"The rule is if you shoot it you must eat it. Unfortunately for him he is not a great fan of duck," Ms Hills said.
"[The competition] was a good incentive to see what I could do ... When I opened the fridge a few months ago and realised I still had four ducks and a couple of chorizo sausages, I wondered what would happen if I threw them into the mincer."
She experimented and knew she had perfected the recipe when Todd and his friend went back to the pan for seconds.
Still overstocked with frozen duck meat, Ms Hills entered another original duck recipe called "smokey breasts", in addition to a tongue-in-cheek entry that involved splashing raw oysters with lemon juice.
As well as taste-testers, the family were roped in to help match each dish with a Monteith's beer for the competition.
Ms Hills was stunned her rissoles took out the top prize. "They just phoned me at work and I thought oh yeah, they'll just be saying thanks for entering ... I couldn't believe it, really."
For the main prize, Ms Hills and husband Stephen flew to Auckland as special guests for the live "cook off" final in the competition's professional chef division.
The pair were sworn to secrecy as to which of the seven finalists took out the Monteith's Beer & Wild Food Challenge, but enjoyed an up close view of the action and tasting each dish.