Today's Wattie's in the bottle with the old recipe in the pot. Photo / Conor MertensToday’s Wattie’s in the bottle with the old recipe in the pot. Photo / Conor Mertens

Mertens halved the recipe and ended up with three litres of sauce. Photo / Conor MertensMertens halved the recipe and ended up with three litres of sauce. Photo / Conor Mertens

"A clear verdict," said chef Conor Mertens, crowning the 1940s recipe as the winner. Photo / Conor Mertens“A clear verdict,” said chef Conor Mertens, crowning the 1940s recipe as the winner. Photo / Conor Mertens

Wattie’s ‘Secret’ Tomato Sauce – 1940s recipe

Given to Violet Edna Bodle by Sir James Wattie.

Conor Mertens said tomato sauce tastes like the beginning of New Zealand's iconic Wattie's one. Photo / Conor MertensConor Mertens said tomato sauce tastes like the beginning of New Zealand’s iconic Wattie’s one. Photo / Conor Mertens