Kitchen expert Fiona Mair told Choice: "I grew up with the tomato sauce in the cupboard. But I now keep it in the fridge once opened, especially if I don't use it often," she says.
"In my opinion it's less runny in the fridge. If the weather is hot the sauce becomes runny when stored in the cupboard."
However fridge expert Ashley Iredale reckons the whole "refrigerate after opening" action is more about marketing than food safety.
"If it's in the door of your fridge it's in your face all the time, but in the cupboard it's hidden away," he told Choice.
"Tomato sauce is high enough in sugar and salt (preserving agents) that it's shelf stable, even when opened, provided you don't introduce contaminants."
However, there is one official take on the whole tomato sauce debate.
The folks at Heinz Ketchup released an official statement as to where their product belongs and they have a definitive answer - the fridge.
“Because of its natural acidity, Heinz® Ketchup is shelf-stable. However, its stability after opening can be affected by storage conditions. We recommend that this product, like any processed food, be refrigerated after opening. Refrigeration will maintain the best product quality after opening,” the statement read.
Wherever you choose to store it, a top Australian tomato sauce has been crowned.
Choice enlisted the help of three expert taste testers - food consultant Tawnya Bahr, food industry expert Adam Moore, and chef and food expert Peter Van Es - to try out 22 different sauces.
The sauces were judged on taste, flavour, texture and aroma as well as the sauce's nutritional benefits, based on the Health Star Rating.
With a total score of 79 per cent, Community Co's 'A Squeeze of Tomato Sauce' was crowned king and is available at IGA stores nationally for only $1.50 a bottle.