It was Mr Lam's fifth supreme pie award after he first entered in 2003, and he expects his sales will increase following Tuesday's success.
"We'd normally sell 200-300 pies a day," he says. "It'll go out the roof, 1200 pies just overnight."
It wasn't the only prize Mr Lam was awarded - his classic steak and cheese took out silver, while his gourmet fruit pie consisting of Cointreau pear, apple and cherry cheesecake managed a Highly Commended.
Celebrity judge and top chef Mark Southon says there was a huge variety in the entries, which were spread across 12 categories.
"We saw some interesting skills and flavours, such as alpaca and kimchi; braised lamb shank and butter chicken. There were nostalgic and Kiwi heritage pies like creamed paua, smoked fish and the addition of kumara to some pies."
It took 21 judges more than 10 hours to judge the 5284 pies entered in the competition.
"The judging process was very impressive, stringent, and obviously tried and true with over 20 years' experience," Mr Southon says.
But in the end, it was Mr Lam's bacon and egg pie which came out on top.
Steak (Diced) and Gravy – Michael Kuoy of Counties Bakeries, Pukekohe
Chicken and Vegetable – Savanchamroeun Ly of Savans Bakery, Warkworth
Gourmet Fruit – Bunnarith Sao of Dairy Flat Bakery, Auckland
Gourmet Meat – Roger Cathro of Pak ‘n Save, Petone, Wellington
Vegetarian – Jason Danielson of The Bakery Wholesale, Wanaka
Bacon and Egg – Patrick Lam of Patrick’s Pie Group Gold Star Bakery, Tauranga
Mince and Cheese – Buntheng Wong of Panmure Bakehouse, Auckland
Steak and Cheese – Geemun Chao of Baker Bobs Bakery & Café, Greerton, Tauranga
Potato Top Pie – Roger Cathro of Pak n Save, Petone, Wellington
Commercial Wholesale Mince and Cheese – Terry McMahon of Couplands Bakeries, Hornby, Christchurch