“It’s hard to imagine civilisation without onions.”
I wandered into my local supermarket in Italy and saw the three colours of onion – red, yellow and white. White? Why would anyone use them I wondered. And then there was also green…. So I asked, and the friendly shopkeeper informed me in full.
Yellow onions (white flesh, golden brown skins) are the gold standard for cooking. They have the strongest flavour – and this is important as onions lose the intensity of flavour in the cooking process. They also tend to caramelise and become sweeter as they cook. They keep brilliantly for weeks in a cool dark place. They are the mainstay of every cook, but are rarely the principal performer – French onion soup gives them the pole position – thick and rich, it’s a dish which does them proud.
White onions (white flesh, white skins) have a less intense flavour than yellow. When cooked they are less sweet and slightly crunchier than yellow onions. So I was right really – why bother with white onions, when you can achieve a softer taste if you need to by more convenient means (see banana shallots, below). They don’t keep as well as yellow onions.
Red onions (purplish red skins, white flesh shot through at the edges with red) are softer and sweeter in taste than yellow and white onions. And they have looks – their red edges add visual impact to a dish. Because of their mildness some people use them raw in salads and sandwiches – I still find this too much ‘in your face’, but I do think they are good raw in salsas. Because of their visual advantages they’re also good in a dish of roasted Mediterranean vegetables, served at the table on a big antique platter (but bear in mind they lose their colour on cooking). They don’t keep as well as yellow onions.
Shallots, including échalotes grises
Normal shallots have an intense, sweet taste – it’s wonderful but they are hell to peel. Even worse are the échalotes grises. It’s easier to find a summer day in England than these little wonders of alliumness, probably just as well since their hard, grey shell of a skin is even tougher to peel away from their purple inner bulbs than ordinary shallots. Peeling both types is a pain – blanch the brown type for a few minutes in just boiled water and the skins will come off more easily.
Banana shallots or echallions
Banana shallots are half onion and half shallot and have the benefits and disadvantages of both. To my mind the benefits of both outweigh the disadvantages and I use these little marvels all the time. I really can’t be bothered with fiddling around trying to peel shallots. I don’t always want the indiscreet, in-your-face flavour of onions – and if I’m cooking just for two I don’t want half a left-over onion floating around in my fridge imparting its odour generously on everything around it. Shallots are a much better option if you need half an onion. If you need a slightly sharper flavour grind in more pepper.
Ramps are wild leeks – they have a small, non-bulging bulb, often picked out with pink and broader leaves which you can also eat, but which have a softer flavour. Ramps taste of a mix of onion and garlic.
Spring onions (known in the States as ‘scallions’ or ‘green onions’)
These are mild so they don’t need to be cooked, but they add a sparkling zing to both salads and stir fries. I usually use about an inch (2 cms) of the green part which has a slightly stronger taste than the white. Thinly sliced spring onions work well as an improtu garnish, strewn over anything which looks a bit dowdy. They have a high water content so they will rot if kept in plastic bags…. which is why they are usually sold in bunches, kept together with rubber bands.
Sometimes spring onions – which are simply onions which have been harvested before their bulbs have been allowed to form, are allowed a little bulge – Americans call these spring onions. The Catalan calcot onion is treated in a different way, but it’s broadly the same idea as well.
Pearl onions are milder and sweeter than their big brothers, and they come red, yellow and white. They are great glazed, or roasted with apple balsamic vinegar. Peeling them is a pain – blanch for a few minutes in just boiled water and the skins will come off more easily.
You come across sweet onions more in the States. They often look a bit squashed up. They have more water, and less sulphur which means they are less pungent (hence sweeter). Vidalia are the best known, but there are also Maui, Bermuda and Walla Walla varieties. Vidalia is a registered trademark for onions, which come from Georgia in the States. In Europe Spanish onions are probably the sweetest you’ll find. They don’t keep as well as yellow onions. They’re mild enough to eat raw. They don’t keep so well, so the fridge is best. Caramelised sweet onions go well in mashed potato, or in a tomato sandwich or salad.
Garlic and young (or green) garlic
Wandering around South Kensington Farmers’ Market the other day I spotted some wild garlic. The friendly stallholder cheerfully admitted that when she first saw them she thought they were spring onions.
How can you distinguish between onions and garlic? Both garlic and onions are alliums – but garlic will grow in colder climates.
Most people can distinguish between mature onions and garlic, but young garlic and onions look very similar. The garlic with have flat rather than tube-shaped leaves, and you will see pale pink or purple spots on the white part of the plant above the bulb.
The problem arises in distinguishing between young garlic and young leeks, both of which have flat leaves. The only way to do it is to use your nose – garlic will smell like garlic! Fry chopped green garlic gently in butter before you add beaten eggs to make scrambled eggs.
Storing, cooking and preparing onions
- A medium yellow onion (6.5 cm/2.5” diameter) will weigh about 70g/2.5 oz
- Most do best stored in a cool, dark place – not in the fridge
- Prepare them just before using – they start to lose their flavour after being cut
- Some people chop their onions wearing swimming goggles (yes, honestly); others under running water; I think the trick is to have a good, sharp knife – the sharper the knife the less spray there is. If you have an academic interest in onion tears follow this link to Rose-Lynn Fisher’s amazing site, where she’s posted super-close up images of onion tears… and of very different tears ‘of laughing till I’m crying’; ‘of grief’; ‘of reunion’…. and much more
- don’t discard the onion skins, or the layer below – they’re packed with goodness, fibre and a pigment called quercetin which helps to reduce blood pressure. Add to soups and stews and remove before serving.
- Cook them gently, if you fry in very hot oil they go bitter