Whether it's Dijon or wholegrain, the preservatives in mustard mean it's completely safe to keep in your pantry after opening.
It wouldn't be entirely ridiculous to assume that because of the high sugar content, jam won't spoil after opening if you keep it in the cupboard.
In the US, eggs are sterilised after production to kill bacteria, which also weakens the eggshell. This means they should be kept cool to prevent the bacteria from returning.
Sesame oil and other unrefined nut oils are prone to going rancid and losing their flavour if kept at room temperature.
Infused oils are a great way of injecting extra flavour into marinades and salad dressings, or to finish a dish. What's more, they're super easy to make at home but you should be aware that there is a risk of botulism.
Whether ketchup should be stored in the fridge or in the store cupboard is somewhat of a contentious question. Some people assume that due to ketchup's high vinegar.
One of the few fruits that benefit from refrigeration are apples. This is because apples release ethylene gas which speeds up the ripening of any nearby fruit and veg.
Whether butter should go in the fridge or in a covered dish in the pantry is a hotly debated question. According to Dairy UK, butter should definitely be kept in the fridge to preserve its colour and flavour.
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