Preparations took place weeks ahead, and there were many issues to work out along the way.
"It's not that easy receiving recipes for four portions and upsizing to 350 - that's a challenge in itself," Mr Power said.
As well as that, he had to source pikopiko - fern fronds - which he had never cooked with before. He used native kawakawa and horopito as spices and had to find many kilos of Maori potatoes and watercress.
"I've never cooked so much watercress in my life. I've only used it as a salad ingredient before."
The meat in the hangi-style pork belly main dish on Saturday was first steamed for three hours then hot-smoked over manuka chips and lightly cooked in the oven. It was served with baby carrots and a watercress sauce.
The venue was a hit, too. Mr Power said the Wanganui War Memorial Centre had been upgraded and was a credit to the district council.
Outside event managers had been stunned by its good parking, central location, helpful staff and the variety of rooms it offered, he said.