Learn onion cuts and choose the best one for each dish

Onions are one of the most useful ingredients you can learn to prepare properly. They show up in everything from pasta sauces and curries to salads, stir fries and sandwiches, so knowing a few different ways to cut them can make cooking much easier.

The best cut to use depends on what you are making. Some dishes need onions to melt down into the background, while others work better when the onion keeps its shape and texture.

This guide, along with the videos, will show you how to cut onions safely and when to use each style.

Why the cut matters

It is easy to think an onion is just an onion, but the way you cut it can change the texture, flavour and overall feel of a dish.

A finely diced onion will cook down quickly and almost disappear into a sauce. A sliced onion will stay more noticeable and can add softness and sweetness. Larger chunks or wedges hold their shape better, which works well in traybakes, roasted dishes or skewers.

Choosing the right cut helps your food cook more evenly and gives you a better result.

Standard diced onion

A standard dice is slightly larger than a fine dice, but still cut into neat small chunks.

This is a good all-round option for fajitas, stews, casseroles, pasta dishes and fillings where you still want to notice the onion a bit more. It gives flavour and texture without being too chunky.

If you are not sure which cut to choose, diced onion is usually the safest place to start.

Sliced onion

Sliced onion is cut into thin strips rather than cubes. This cut is great when you want the onion to stay visible and soften into long strands as it cooks.

Sliced onion works especially well in stir fries, burgers, sandwiches, wraps and curries. It is also a good choice if you are caramelising onions, as the strips cook down into soft, sweet ribbons.

If the onion is meant to be part of the texture of the dish rather than hidden in it, slicing is often the better choice.

Onion rings

Onion rings are made by slicing across the onion to create circles.

These are useful when presentation matters a bit more or when you want a more distinct onion shape. They are often used for burgers, salads, fajita platters or, of course, battered onion rings.

They are less common for everyday base cooking, but good to know if you want a more decorative finish.

Which onion cut should you use?

Want the onion to disappear into the dish? Go for a fine dice.

For a simple, everyday option, use a standard dice.

If you want soft strips of onion that are still noticeable, choose slices.

If you need the onion to keep its shape, go for wedges or chunks.