Caramelised onions become richer and silkier when a single simple ingredient is added to the pan after cooking. Chef Lindsey Farr says that butter is essential when preparing caramelised onions because it "adds richness and flavour".
Why butter makes the difference
The chef explained that the butter is "where a lot of the depth comes from". Lindsey urged: "Finish with an extra knob of butter right before serving for a silkier texture".
Because butter contains milk solids, it initiates the browning process faster than vegetable oils, and it coats the onions more attractively. It is also considerably more flavourful than most neutral oils such as vegetable, olive, rapeseed, and sunflower oil.
Choosing the best onions
Red onions, yellow onions, white onions, shallots, and extra-sweet varieties are all excellent choices – each produces subtly different outcomes, some sweeter, others more bitter. Frequently, the finest results come from combining different onion types, though this certainly isn't essential.
Red onions possess a more intense flavour, with a mildly bitter quality and reduced sweetness. Yellow onions, by contrast, deliver plenty of vibrant flavour, very gentle bitterness, and an underlying sweetness. As for shallots, they offer an excellent equilibrium of sweetness, featuring both lively flavours and deep, complex ones, with just a trace of bitterness.
How to caramelise onions tastier
Ingredients: one quarter cup of unsalted butter, one tablespoon of olive oil, 900g of onions cut in half lengthwise and sliced a quarter-inch thick, one teaspoon of sugar, sea salt to taste, and black pepper to taste.
Begin by melting the butter and olive oil in a large pan over medium-high heat. This should take approximately one to two minutes and appear glossy and smooth. Add the onions and stir to ensure even coating, spreading them into a uniform layer so they cook evenly. Sprinkle with sugar, which accelerates the caramelisation process from the outset.
Cook, stirring periodically, until softened, roughly 15 minutes. Keeping the heat at medium initially helps avoid burning. Continue cooking, stirring every few minutes, until they turn a rich golden brown and develop a jammy consistency, roughly 30 to 45 minutes more.
Lindsey highlighted that the most common error people make when learning how to caramelise onions is hurrying the process. If they begin to brown too rapidly, reduce the heat. Proper caramelisation is gradual and should not be rushed. It generally takes 45 to 60 minutes to "properly caramelise onions". Quicker methods frequently lead to patchy browning or charring.
Take the onions off the heat and season with salt and pepper. Mix thoroughly and use straight away or store.
