They add incredible flavor, and can either be sweet or savory. .onion is a special-use top level domain suffix designating an anonymous onion service (formerly known as a "hidden service") reachable via the Tor network. The white part of the green onion is a common flavoring in Mexican, Chinese, Korean, and British cuisine, often serving as an aromatic base of a dish. The most common types are red, yellow, and white onions. Sweet onions have thinner skins than other onions, are juicier than other onions, and don't keep in storage as long as other onions. The onion’s characteristic pungency results from the sulfur-rich volatile oil it contains; the release of this oil during peeling or chopping brings tears to the eyes.

Onions vary in size, shape, color, and flavor. Onions are among the world’s oldest cultivated plants. Green onions, commonly called scallions, salad onions, and baby onions, are fresh, leafy green onions that do not develop a bulbous root and is widely used in cuisines all over the world. Red onions are an attractive, milder alternative to the yellow onion with their shiny purple skin and red-tinged flesh. Spring onions are sweeter and mellower than regular onions, but the greens are more intense in flavor than scallions.
Surgery: Onion might slow blood clotting and lower blood sugar.

Brianne Du Clos The infographic, produced by She Knows, covers a range of different onion types with some useful tips on how they taste, what they look like and what they should be used for when cooking in the kitchen.A great resource for anyone wanting to quickly learn more about different onions and how to use them when cooking. Onions are essential to delicious-tasting food.

Shallots are a sub-species of onion; they are …
Onions are a decent source of fiber, which accounts for 0.9–2.6% of the fresh weight, depending on the type of onion.

They are very rich in healthy soluble fibers called fructans. They were probably known in India, China, and the Middle East before recorded history.

The bulbs can be red or white, depending on the varietal, and while they can be used in much the same way as regular bulb onions, they are great grilled, roasted whole, or used like pearl onions. For these reasons, look for sweet onions that feel heavy for their size and without any bruises or blemishes so they keep as well as possible.