(E)-1-Propenyl 2-propenyl disulfide

The onion (Allium cepa) (Latin 'cepa' = onion), also known as the bulb onion or common onion, is used as a vegetable and is the most widely cultivated species of the genus Allium. This genus also contains several other species variously referred to as onions and cultivated for food, such as the Japanese bunching onion (A. fistulosum), the Egyptian onion (A. ×proliferum), and the Canada onion (A. canadense). The name "wild onion" is applied to a number of Allium species but A. cepa is exclusively known from cultivation and its ancestral wild original form is not known, although escapes from cultivation have become established in some regions.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.

With a history of human use of over 7,000 years, garlic (Allium sativum) is native to central Asia, and has long been a staple in the Mediterranean region, as well as a frequent seasoning in Asia, Africa, and Europe. There are two sub-varieties of allium sativum: Allium sativum var. sativum (soft-necked garlic) and Allium sativum var. ophioscorodon (hard-necked garlic). Soft-necked garlic is the most commonly found. Bulb garlic is available in many forms, including fresh, frozen, dried, fermented (black garlic) and shelf stable products (in tubes or jars). [Wikipedia]

Soft-necked garlic is one of the most commonly found subspecies of garlic. Soft-necked garlic includes artichoke garlic, silverskin garlic, and creole garlic. [Wikipedia]