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How to preheat an oven – all you need to know

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Whether you’re baking bread, roasting some vegetables, or cooking a lasagne – most oven recipes require that you preheat the appliance. It’s an essential step to ensure that your meals are put in the oven at exactly the right time and come out just the way they should. Nothing is more disappointing than finding that your food is undercooked or burnt. Here’s what you need to know about preheating your oven. 

Why preheat the oven?

Preheating the oven matters. When you switch on the oven it will gradually heat up – climbing from room temperature all the way to the set heat. This process can take between 10 to 15 minutes and even though it may seem annoying having to wait around for the oven to preheat, it’s important to do so because most recipes are based on dishes being cooked at a set temperature. 

Generally, for baked goods with eggs and flour and dishes that cook quickly definitely preheat the oven. If you put in a dish too early, while the oven is still preheating, and follow the recipe, chances are that after the recommended time in the oven it won’t be cooked properly. Then you’re left to improvise and wait around to monitor when it’s done. This means you could run the risk of burning your food. 

More fragile baked goods like cakes or croissants can be completely ruined if they’re under- or overdone, so preheating the oven is essential.

How to preheat the oven?

Usually, you don’t have to turn on the oven right away, that is when you’re still preparing the food. If you’re following a recipe, it will usually tell you when to turn on the preheat. 

If you need to prep a lot of ingredients before you can begin to cook a meal as is the case for more complex oven dishes like lasagne, you won’t need to turn the oven until 10 to 15 minutes before you’re ready to get cooking or baking. Easier dishes like pizza may not always need preheating, but it’s best to check the recipe.

So how do you know when the oven is preheated correctly? Some ovens have digital controls. Simply check the screen to see if it has reached the desired temperature. Traditional gas oven models tend to turn off and there’ll be a noticeable silence.

How long does it take to preheat an oven?

A good rule of thumb is, convection or fan ovens tend to heat up much faster, so wait until 10 minutes before you end your preparations to start preheating. Standard gas ovens are a little slower and should be preheated 15 to 20 minutes before you add a dish for cooking.

To get the temperature perfect, you could invest in an oven thermometer. They’re available from most homeware shops and online and ensure that every meal comes out just right. No more burning! 

There’s not usually any danger from preheating an oven too long other than wasting energy. The oven will just continue to turn on and off to maintain your set temperature.

While following a recipe is generally recommended to ensure your dishes cook or bake the way you want them to, always follow your nose, taste buds, and eyes when cooking. 

For more useful handy hints and tips check out our other articles on how to clean a ceramic hob, how does a self-cleaning oven work or how to decipher oven symbols.

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