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Yellow onions are the dependable base behind a good pan

Also called brown onions, cooking onions

Yellow onions bring savoury depth, sweetness after slow cooking and enough firmness for roasting. Choose heavy, dry bulbs with papery skins and keep them cool, dark and well ventilated.

89.1 g water 11 recipes here use it

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Yellow onions with one cut in half to show the pale layers
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The numbers

Nutrition per 100 g, raw
NutrientAmount% RI
Calories 40 kcal —
Water 89.1 g —
Carbs 9.3 g —
Fibre 1.7 g 7%
Protein 1.1 g 2%
Vitamin C 7.4 mg 9%
Potassium 146 mg 7%

Source: USDA FoodData Central, SR Legacy record for onions, raw; bulb varieties vary · % RI against EU adult reference intakes.

Buying and keeping

What to look for at the shop, and how to make it last once it is home.

How to pick

  • Choose bulbs that feel heavy and hard, with dry papery skin and no soft shoulder.
  • The neck should be tight and dry. A wet or open neck is where rot starts.
  • Pick a bulb with a solid root end and no green shoots if you want it to keep for weeks.
  • Size is about yield, not quality. Small onions can taste strong; large ones are easier to dice evenly.
  • Avoid onions with a sweet fermented smell, wet skin or powdery mould between the layers.

How to store

  • Keep whole onions in a cool, dark, dry place with air moving around them, not in a sealed cupboard box.
  • Do not store whole onions beside potatoes. Moisture and gases shorten the life of both.
  • Keep a cut onion covered in the fridge and use within three to four days.
  • Sliced onions freeze well for soups, braises and sauces, though they lose their raw crunch.
  • Use sprouting onions quickly after removing the green shoot if the bulb is still firm.

Best months

If you have none

Swaps that hold up, with what changes when you use them.

White onion Use one for one. It is sharper raw and a little less sweet after cooking.
Red onion Good in almost every cooked dish, with more colour and a fruitier raw bite.
Shallots Use two to three shallots for one medium onion. They cook faster and taste more delicate.
Leek Use the white and pale green part for a softer, sweeter base. Allow extra time for washing out grit.

Why yellow onions do so much work

Yellow onions have enough sharpness to wake up a stew and enough sugar to become sweet when given time. They are the onion I reach for when the recipe does not specify a variety, because their flavour can move in several directions. Raw, they are crunchy and hot. Fried slowly, they become soft and savoury. Roasted in wedges, they hold their shape at the edges while the middle turns tender.

The skin is not wasted, either. Dry yellow skins can colour a stock, though I use them only when they are clean and free from mould. The edible layers should be firm and white or pale gold inside. A translucent wet layer is a warning to cut farther in and check the rest rather than assuming the whole bulb is fine.

Cutting without tears

Chill the onion for ten minutes if your eyes are sensitive, then leave the root end attached while you halve and peel it. Slice from the stem towards the root, make a few horizontal cuts if you need dice, then cut across. A sharp knife matters more than speed. A blunt knife crushes cells and sends more onion vapour into the air.

For wedges, cut through the root so the layers stay together. For a sauce, a fine dice melts sooner. For a tray, thick wedges are better because thin pieces burn while the rest of the vegetables are still firm. I remove the root at the end, not the beginning; it gives the onion something stable to hold while I cut.

Raw, softened or deeply browned

Onions need room in the pan. If you pile them into a small saucepan, they release water and turn pale before they can colour. Use a wide pan and medium heat for a soft golden base. Add salt early when you want the onion to collapse, or later when you want the edges to stay distinct. A splash of water can loosen browned bits, but it cannot replace the flavour of time.

Caramelised onions are not a twenty-minute job if you want proper depth. Keep the heat moderate, stir when the bottom colours and add a spoon of water if the sugars catch. Stop when the onion tastes sweet and savoury, not when it is merely brown. For everyday cooking, ten minutes of softening is usually enough. It gives the base shape without turning dinner into a project.

Where the comparison helps

Use red bell pepper when the base needs sweetness and colour beside the onion. For a softer allium, compare poblano peppers only as a flavour partner, not a direct replacement. The closest dedicated guide is leeks vs onions, which explains when a milder allium earns its space.

Questions

Are yellow onions the same as brown onions?
In many shops, yes. Brown onion is a common name for the golden-skinned cooking onion sold as yellow onion in some markets.
How long do yellow onions last?
Whole cured onions can last several weeks in a cool, dry, ventilated place. Cut onions belong covered in the fridge.
Why did my onion sprout?
Age, warmth and light encourage sprouting. A firm sprouting onion can be used soon after removing the green shoot; discard soft or mouldy bulbs.
Can I freeze yellow onions?
Yes, chopped or sliced onions freeze well for cooked dishes. They will not keep their raw crunch after thawing.
How do I make onions sweet?
Cook them slowly in a wide pan with enough time for water to leave. Browning needs space and moderate heat, not a covered, crowded pan.

Recipes using yellow onions

11 on the site so far.

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Guides about yellow onions

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