Never cook dumplings with the lid tightly closed, as they could rise up and block the safety devices. Cook the stew and at the end of cooking, release the steam and cook gently for about 10 - 15 minutes without the lid on.

• Pressure cooking times vary according to the size of individual pieces or thickness EN of the food, not the weight.

To prevent discolouration of the interior, caused by mineral deposits in hard water areas, add a tablespoon of lemon juice or vinegar.

Cooking containers must withstand temperatures of 130°C (250°F). Any covering on containers, e.g. foil, greaseproof paper or cling film, must be securely tied otherwise they could block the safety devices. Do not use plastic lids as they prevent steam from being in contact with the food. Also, they could distort and come off during cooking which could block the safety outlets.

Accurate timing is essential when pressure cooking to prevent overcooking, especially with vegetables, fruit and fish.

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