Asparagus is a type of vegetable obtained from one particular species of the many within the genus Asparagus, specifically the young shoots of Asparagus officinalis. It has been used from very early times as a culinary vegetable, owing to its delicate flavour and diuretic properties. There is a recipe for cooking asparagus in the oldest surviving book of recipes, Apicius's 3rd century CE De re coquinaria, Book III.
The English word "asparagus" derives from classical Latin, but the plant was once known in English as sperage, from the Medieval Latin sparagus. This term itself derives from the Greek aspharagos or asparagos, and the Greek term originates from the Persian asparag, meaning "sprout" or "shoot." The original Latin name has now supplanted the English word. Asparagus was also corrupted in some places to "sparrow grass"; indeed, John Walker stated in 1791 that "Sparrow-grass is so general that asparagus has an air of stiffness and pedantry." Another known colloquial variation of the term, most common in parts of Texas, is "aspar grass" or "asper grass."
n their simplest form, the shoots are boiled or steamed until tender and served with a light sauce like hollandaise or melted butter or a drizzle of olive oil with a dusting of Parmesan cheese. A refinement is to tie the shoots into sheaves and stand them so that the lower part of the stalks are boiled, while the more tender heads are steamed. Tall cylindrical asparagus cooking pots have liners with handles and perforated bases to make this process foolproof.
Unlike most vegetables, where the smaller and thinner are the more tender, thick asparagus stalks have more tender volume to the proportion of skin. When asparagus have been too long in the market, the cut ends will have dried and gone slightly concave. Meticulous cooks scrape asparagus stalks with a vegetable peeler, stroking away from the head, and refresh them in ice-cold water before steaming them; the peel is often added back to the cooking water and removed only after the asparagus is done, this is supposed to prevent diluting the flavor. Small or full-sized stalks can be made into asparagus soup. Cantonese restaurants in the United States often serve asparagus stir-fried with chicken, shrimp, or beef, also wrapped in bacon. Asparagus may also be quickly grilled over charcoal or hardwood embers, for an infusion of smoke flavor. Asparagus is one of few foods which is considered acceptable to eat with the hands in polite company, although this is more common in Europe.
ome of the constituents of asparagus are metabolised and excreted in the urine, giving it a distinctive, mildly unpleasant odor. The smell is caused by various sulfur-containing degradation products (e.g. thiols and thioesters). Studies showed that about 40% of the test subjects displayed this characteristic smell, and a similar percentage of people are able to smell the odor once it is produced; whether there is any correlation between production and detection of the smell is unknown. The speed of onset of urine smell is rapid, and has been estimated to occur within 15-30 minutes from ingestion.
Asparagus is the best vegetable provider of folic acid.
