I’ve always thrown away the oil cap – a colleague explained to me what it was actually used for

Keep the cap clean to reuse it
Every time you use the bottle, make sure to keep the cap clean and in place. This way, you will prevent the oil from spilling or splashing, and you will also preserve the contents better, by reducing the exposure of the oil to the air.
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This simple practice can help you be more precise when cooking, reduce oil waste, and keep your work area clean. So, next time you open a bottle, remember not to throw away the cap – it can become your best ally in the kitchen.