Onions and Meat: Which Onion to Use and How to Cook It

Almost every great meat dish starts with, or finishes with, an onion. It might be the slow-cooked base of a braise, a crisp ring on a burger or a sharp, pickled slice that cuts through a fatty roast. But onions are not interchangeable. Each type has its own balance of sweetness and bite, and it changes in a different way when you cook it. Pick the right one and your meat tastes richer, juicier and more balanced. This guide explains what heat does to an onion, then matches each type to the meats and cooking methods it suits best.

What happens when you cook an onion

Raw onions get their sharp, eye-watering bite from sulphur compounds. These break down slowly over gentle heat, which lets the onion's natural sweetness come forward [2]. At the same time, some of the onion's complex carbohydrates turn into simpler sugars that taste sweeter, and as cooking continues those sugars brown and develop deep, rich, almost jammy flavours [2]. Onions already contain plenty of natural sugar, so there is no need to add more [2].

This is a different process from the browning on a seared steak, which comes from the Maillard reaction between sugars and proteins on the meat's surface [2]. The two work together beautifully: well-browned meat brings savoury depth, and well-cooked onions bring sweetness to balance it.

Patience pays off

True caramelised onions take time. About an hour over low-to-medium heat is a sensible guide, because high heat scorches the outside before the sugars have time to develop [2]. You can speed up the early softening stage by adding a splash of water, but the final browning cannot be rushed [2]. Make a big batch: caramelised onions keep well in the fridge and lift steaks, burgers and sandwiches all week.

Our onions at a glance

• Organic Yellow Onions: naturally sweet, full-flavoured all-rounders that caramelise well. From Holland, 500g.
• Red Onions and Spanish Red Onions: sweet-tangy and deep purple, great raw, grilled or pickled. From Spain.
• Holland White Onions: crisp, clean and milder than yellow onions, ideal raw. 500g.
• White Pearl Onions: small, uniform onions that turn sweet and buttery when roasted or braised whole. From Holland, 200–250g.
• Japanese Leek (Negi): mild, sweet and tender, a staple of sukiyaki and yakitori.

Matching onions to meat

1. Yellow onions: the base for braises, stews and caramelised toppings

Yellow onions are the go-to when a recipe simply says "an onion". They are pungent raw but mellow and sweeten as they cook [1], which makes them the natural foundation for slow-cooked meat. Soften a few sliced onions before adding lamb shanks or pork belly to a braise, and they will melt into the sauce. For burgers and steaks, slow-cook them into a sweet, golden topping.

Try: Organic Yellow Onions with Frozen Lamb Shank or Australian Pork Belly (Skin On), plus a few sprigs of Fresh Thyme.

2. Red onions: raw, pickled or grilled with rich, fatty meats

Red onions are milder than yellow onions when raw, which is why they shine in salads, sandwiches and quick pickles, where they also turn a bright pink [1]. Their tangy crunch is the perfect contrast to rich, fatty meats: pile pickled red onion onto crispy pork belly or a grilled lamb rack. Thick rings also hold together well on the grill alongside steaks.

Try: Red Onions with Australian Lamb Rack (Cap On) or Wagyu Beef Ribeye Cap MB 8/9.

3. White onions: crisp and fresh on burgers and steak salsas

White onions are the mildest of the common storage onions and have a crisp texture raw, making them ideal for salsas, tacos and other fresh toppings [1]. When cooked, their flavour becomes more muted [1], so use them where you want fresh crunch rather than deep sweetness. A finely diced white onion and tomato salsa is a bright partner for chargrilled beef, and thin raw rings are the classic burger topping.

Try: Holland White Onions with Mmmm House-Marinated Beef Burger Patties or Fresh Grain-Fed Minced Beef.

4. Pearl onions: whole, sweet bites in braises and on skewers

Pearl onions taste much like regular onions but are small enough to cook whole, typically in braises or pickled [1]. Added to a slow-cooked lamb shank for the last hour, they soften into sweet, glossy bites that hold their shape. They are also excellent threaded between chunks of meat on BBQ skewers. Tip: blanch them for a minute in boiling water and the skins slip off easily.

Try: White Pearl Onions with Frozen Lamb Shank.

5. Japanese leek (negi): sweet and gentle in sukiyaki and hotpot

Leeks are milder, sweeter and less pungent than bulb onions [1], and Japanese negi turns especially sweet and tender in a simmering pot. Cut it into thick diagonal pieces and brown them in the pan first, then add thinly sliced beef and sukiyaki sauce so the leek soaks up the savoury-sweet broth.

Try: Japanese Leek (Negi) with Sukiyaki Beef and Hinode Japanese Sukiyaki Sauce.

6. Short on time? Ready-made onion flavour

When there is no hour to spare for caramelising, a jar does the work. A spoonful of balsamic caramelised onion chutney on a steak or burger gives instant sweet-sour depth, and a crispy garlic and caramelised onion oil adds a fragrant finish to stir-fried beef or a bowl of rice.

Try: Snowdonia Chutney, Balsamic & Caramelised Onion or Confit Crispy Garlic & Caramelized Onion Oil.

Quick reference

Practical tips:

• Cook onions in the meat's fat. After searing sausages, steak or pork belly, soften your onions in the same pan to pick up all the browned, savoury bits.
• Keep the heat moderate for caramelising. Low and slow gives sweetness; high heat gives burnt edges and raw centres [2].
• Quick-pickle red onions. Slice thinly and cover with vinegar, a pinch of sugar and salt for 20 minutes: an instant topping for rich meats.
• Store whole onions somewhere cool, dry and dark, and keep cut onions sealed in the fridge.

Stock up on onions and more in our Vegetables collection, then pick your cut from our Meat range.

References

1. Tasting Table. The Most Popular Types Of Onions Explained. tastingtable.com
2. Tasting Table. Do Caramelized Onions Really Take An Hour To Cook? tastingtable.com