Bicarbonate of soda cuts onion caramelisation time down to exactly ten minutes.

We have all fallen victim to the greatest lie in cookbook history: “Caramelise the onions (approx. 10 minutes).” Anyone who has ever tried to make a proper French onion soup or a rich chutney knows the frustrating reality. Achieving perfectly sweet, jammy, deeply browned onions requires a minimum of 45 minutes of constant, tedious stirring over a hot cooker.

But what if we told you there is a clever kitchen hack that makes that 10-minute myth a brilliant reality?

The Magic of Bicarbonate of Soda

• Bicarbonate of soda cuts onion caramelisation time down to exactly ten minutes.
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Enter your new best friend: bicarbonate of soda. Yes, the exact same humble white powder sitting in your baking cupboard can literally shave 35 minutes off your onion caramelisation time. By simply adding a tiny pinch of bicarb to your frying pan, you can achieve flawlessly caramelised onions in exactly ten minutes.

How Does It Actually Work?

It all comes down to basic chemistry. The browning of onions is caused by the Maillard reaction, a chemical process that creates those complex, savoury, and sweet flavours we all love. Here is the secret: the Maillard reaction accelerates significantly in an alkaline environment.

When you add a pinch of bicarbonate of soda, you instantly raise the pH level in the pan. This drastically speeds up the breakdown of the onions and the caramelisation of their natural sugars, giving you that rich, dark brown result in a fraction of the time.

How to Try the Hack

• Step 1: Slice your onions as you normally would and add them to a pan with a splash of oil or a knob of butter over medium heat.
• Step 2: Sprinkle in a very small pinch of bicarbonate of soda. (Be careful not to add too much, or your onions will turn out mushy and taste soapy—a quarter teaspoon for every three large onions is plenty!)
• Step 3: Stir regularly. Watch in sheer amazement as the onions dramatically soften and brown in just 10 minutes.

Say goodbye to the 45-minute stirring marathon. Whether you are whipping up some gourmet hot dogs, a quick weeknight curry, or a posh cheese toastie, this genius hack will change the way you cook forever.