Onion

onionsonion (Allium cepa)bulbsA. cepaAllium cepachopped onionsA. cepa'' var. ''cepaAggregatum Groupboiled onionsbulb
The onion (Allium cepa L., from Latin cepa "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus Allium.wikipedia
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Garlic

garlic clovesGarlic ProductionLargest garlic producer
Its close relatives include the garlic, leek, chive, and Chinese onion.
Its close relatives include the onion, shallot, leek, chive, and Chinese onion.

Allium

wild oniononionalliums
The onion (Allium cepa L., from Latin cepa "onion"), also known as the bulb onion or common onion, is a vegetable that is the most widely cultivated species of the genus Allium.
Allium is a genus of monocotyledonous flowering plants that includes hundreds of species, including the cultivated onion, garlic, scallion, shallot, leek, and chives.

Leek

leeksbaby leeksprei
Its close relatives include the garlic, leek, chive, and Chinese onion.
The genus Allium also contains the onion, garlic, shallot, scallion, chive, and Chinese onion.

Shallot

shallotsAllium cepa'' var. ''aggregatumeschalot
Some varieties of A. cepa, such as shallots and potato onions, produce multiple bulbs.
The shallot is a type of onion, specifically a botanical variety of the species Allium cepa.

Tree onion

scallionA.'' × ''proliferumjjokpa
This genus also contains several other species variously referred to as onions and cultivated for food, such as the Japanese bunching onion (Allium fistulosum), the tree onion (A. ×proliferum), and the Canada onion (Allium canadense). The name "wild onion" is applied to a number of Allium species, but A. cepa is exclusively known from cultivation.
Tree onion, topsetting onions, walking onions, or Egyptian onions, Allium × proliferum, are similar to common onions (A. cepa), but with a cluster of bulblets where a normal onion would have flowers.

Ditylenchus dipsaci

onion eelworm
The crop is prone to attack by a number of pests and diseases, particularly the onion fly, the onion eelworm, and various fungi cause rotting.
Ditylenchus dipsaci is a plant pathogenic nematode that primarily infects onion and garlic.

Allium chinense

Chinese onionrakkyorakkyō
Its close relatives include the garlic, leek, chive, and Chinese onion.
Its close relatives include the onion, shallot, leek, chive, and garlic.

Pickled onion

pickled onionspicklesonions
As a food item, they are usually served cooked, as a vegetable or part of a prepared savoury dish, but can also be eaten raw or used to make pickles or chutneys.
Pickled onions are a food item consisting of onions (cultivars of allium cepa, ) pickled in a solution of vinegar and salt, often with other preservatives and flavourings.

Delia antiqua

onion flyD. antiquaonion maggots
The crop is prone to attack by a number of pests and diseases, particularly the onion fly, the onion eelworm, and various fungi cause rotting.
The larvae or maggots feed on onions, garlic, and other bulbous plants.

Potato onion

Some varieties of A. cepa, such as shallots and potato onions, produce multiple bulbs.
The potato onion (also known as multiplier onion) is a variety of the Aggregatum Group of Allium cepa, similar to the shallot, although producing larger bulbs.

Biennial plant

biennialbiennialsbiennial plants
The onion is most frequently a biennial or a perennial plant, but is usually treated as an annual and harvested in its first growing season.
Examples of biennial plants are members of the onion family including leek, some members of the cabbage family, common mullein, parsley, fennel, Lunaria, silverbeet, Black-eyed Susan, Sweet William, colic weed, carrot, and some hollyhocks.

Sweet onion

Maui onion1015 supersweet onionBermuda onions
Yellow or brown onions (called red in some European countries), are full-flavoured and are the onions of choice for everyday use, with many cultivars bred specifically to demonstrate this sweetness (Vidalia, Walla Walla, Cévennes, "Bermuda," &c.).
A sweet onion is a variety of onion that is not pungent.

Yellow onion

oniononionsYellow
Yellow or brown onions (called red in some European countries), are full-flavoured and are the onions of choice for everyday use, with many cultivars bred specifically to demonstrate this sweetness (Vidalia, Walla Walla, Cévennes, "Bermuda," &c.).
The brown onion or yellow onion (Allium cepa L. ) is a variety of dry onion with a strong flavour.

Red onion

red onionsOniononion, red
The red onion (called purple in some European countries) is a good choice for fresh use when its colour livens up the dish; it is also used in grilling.
Red onions are cultivars of the onion (Allium cepa) with purplish-red skin and white flesh tinged with red.

Pearl onion

Depending on the mature size and the purpose for which the onion is used, these may be referred to as pearl, boiler, or pickler onions, but differ from true pearl onions which are a different species.
porrum), and may be distinguished from common onions by having only a single storage leaf, similar to cloves of garlic.

Allium canadense

Allium canadense'' var. ''canadenseCanada onionwild garlic
This genus also contains several other species variously referred to as onions and cultivated for food, such as the Japanese bunching onion (Allium fistulosum), the tree onion (A. ×proliferum), and the Canada onion (Allium canadense). The name "wild onion" is applied to a number of Allium species, but A. cepa is exclusively known from cultivation.
It was once thought that the tree onion could be related to this plant, but it is now known that the cultivated tree onion is a hybrid between the common onion (A. cepa) and Welsh onion (A. fistulosum), classified as A. × proliferum.

Dolma

dolmadesstuffed grape leavesdolmádés
Their layered nature makes them easy to hollow out once cooked, facilitating stuffing them, as in Turkish sogan-dolma.
Common vegetables to stuff include tomato, pepper, onion, zucchini, eggplant, garlic.

Stuffing

fillingstuffedfillings
Their layered nature makes them easy to hollow out once cooked, facilitating stuffing them, as in Turkish sogan-dolma.
Poultry stuffing often consists of dried breadcrumbs, onion, celery, salt, pepper, and other spices and herbs, a popular herb being sage.

French onion soup

onion soupSoupe à l'oignon
Onions are commonly chopped and used as an ingredient in various hearty warm dishes, and may also be used as a main ingredient in their own right, for example in French onion soup, creamed onions, and onion chutney.
' (French: soupe à l’oignon'' ) is a type of soup usually based on meat stock and onions, and often served gratinéed with croutons and cheese on top or a large piece of bread.

Ploughman's lunch

ploughmanplowmantiller
They are part of a traditional British pub's ploughman's lunch, usually served with crusty bread, English cheese, and ale.
A ploughman's lunch (often abbreviated to just ploughman's) is an English cold meal which is based on bread, cheese, and onions, and usually accompanied by butter and some form of pickle.

White onion

round onionswhite
White onions are the traditional onions used in classic Mexican cuisine; they have a golden colour when cooked and a particularly sweet flavour when sautéed.
White onion (Allium cepa, 'sweet onion') is a cultivar of dry onion, that has a pure white papery skin and a sweet, mild white flesh.

Perennial plant

perennialperennialsherbaceous perennial
The onion is most frequently a biennial or a perennial plant, but is usually treated as an annual and harvested in its first growing season.
Onions, many varieties: potato onions, shallots, Egyptian onions, Japanese bunching onions, Welsh onions, Chinese leeks

Chutney

chutneyschatnichutnies
As a food item, they are usually served cooked, as a vegetable or part of a prepared savoury dish, but can also be eaten raw or used to make pickles or chutneys. Onions are commonly chopped and used as an ingredient in various hearty warm dishes, and may also be used as a main ingredient in their own right, for example in French onion soup, creamed onions, and onion chutney.
These may include sugar, salt, garlic, tamarind, onion or ginger.

Umbel

umbelsumbellateumbellule
The inflorescence takes the form of a globular umbel of white flowers with parts in sixes.
Umbels are a characteristic of plants such as carrot, parsley, dill, and fennel in the family Apiaceae; ivy, Aralia and Fatsia in the family Araliaceae; onion (Allium) in the family Alliaceae.

Dietary fiber

fiberdietary fibresoluble fiber
Most onion cultivars are about 89% water, 9% carbohydrates (including 4% sugar and 2% dietary fibre), 1% protein, and negligible fat (table).
root tubers and root vegetables such as sweet potatoes and onions (skins of these are sources of insoluble fiber also)