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How to Sterilise Jars – Oven Method

Sterilising your jars properly is essential to keep your preserves fresh and safe. Here’s how to do it using a standard oven.

Equipment

  • Clean glass jars (washed in warm soapy water or dishwasher)
  • Matching lids (check they are not rusty or damaged)
  • A baking tray
  • tongs or oven gloves

Instructions

  • Set your oven to 130°C (270°F) – no higher, or jars may crack.
  • Clean jars thoroughly with hot soapy water or run them through the dishwasher. Rinse well.
  • Place the jars (and metal lids, if oven-safe) upright on a baking tray without touching each other.
  • Put the tray in the oven and heat for 20 minutes.
  • Leave the jars inside until you’re ready to use them. This keeps them warm — essential for hot preserves.
  • Fill while hot
  • Remove the jars carefully using oven gloves or tongs. Fill immediately with hot jam/jelly/chutney and seal.

Notes

Some plastic lids or rubber seals may not be oven-safe. These can be sterilised in boiling water for 10 minutes instead.
Always check that jars have no cracks or chips before use.