شَلْغَم سبزی ریشهای است به رنگ سبز و سفید یا بنفش و با برگهایی ناصاف و بریدگیهای زیاد. ریشهٔ آن غدّهای و به شکلهای گرد یا دراز به رنگ سفید با لکههای بنفش میباشد. شلغم نه تنها از نظر داشتن ویتامین و خواص معدنیاش ارزندهاست، بلکه از حیث سایر ویژگیهای غیر غذایی هم سرآمد بوده و در زمره سبزیهای مهم شمرده میشود. شلغم در خانواده سبزیجاتی نظیر کلم بروکلی، کلم بروکسل، کلم برگ و خردل قرار میگیرد.
شلغم گیاهی بومی اروپا و آسیای مرکزی است که هنوز هم در زمینهای وسیع یا در کنار جویبارها به صورت وحشی میروید. رومیهای باستان و مردم اروپا در سدههای میانه شلغم مصرف میکردند. این انگلیسیها و فرانسویها بودند که آن را وارد قاره آمریکا کردند. امروزه، شلغم در بسیاری از نقاط دنیا، از جمله ایالات متحده و کانادا کشت میشود که کالیفرنیا و نیوجرسی بیشترین میزان تولید را دارند.
شلغم متناسب با واریته و زمانی که از رشد آن گذشتهاست میتواند گرد یا فرفرهایشکل باشد که قطر آن از ۵ سانتیمتر تا بیش از ۳۰ سانتیمتر متغیر است. پوست نرمی دارد که به رنگهای سفید، زرد، سبز یا ارغوانی موجود است. گوشته زرد یا سفید شلغم طعم ملایم شیرین، تند و بافتی ترد دارد. در طول سال انواع مختلف آن کشت میشود. نوع ارغوانی «تاپ میلان» که مسطح با نقاطی ارغوانی رنگ است زود رشد میکند و یک محصول زمستانی خوب به حساب میآید. نوع «اسنوبال» که سفید است رشد سریعی دارد و بهطور معمول در بهار کاشته میشود، ولی نوع «توکیو کراس» محصولی است که در تمامی طول سال قابل کاشت و برداشت است. شلغم ژاپنی «هینونا کابو» هم کشیده و شبیه به هویج است.
نشانههای شلغم خوب[ویرایش]
شلغم خوب سه علامت دارد:
بر اساس تحقیقات و بررسیهای دانشمندان، هر صد گرم شلغم دارای ۳۵ کیلو کالری انرژی، ۱ گرم پروتئین، ۷ گرم قند، ۲/۰ گرم چربی، ۱/۱ گرم فیبر، ۴۵ میلیگرم گوگرد، ۲۸۰ میلیگرم پتاسیم، ۶۰ میلیگرم کلسیم، ۳۶ میلیگرم ویتامینC است، همچنین صد گرم برگ شلغم دارای ۳۶ کیلو کالری انرژی، ۳ گرم پروتئین، ۴/۰ گرم چربی، ۵/۵ گرم قند، ۲/۱ گرم فیبر، ۵۵ میلیگرم گوگرد، ۳۷۵ میلیگرم پتاسیم، ۲۶۰ میلیگرم کلسیم، ۶۰ میلیگرم فسفر، ۹ میلیگرم سدیم، ۴/۲ میلیگرم آهن و ۴۰ میلیگرم ویتامینC است.
روش تهیهٔ شربت شلغم به این ترتیب است که: ابتدا وسط یک شلغم را خالی میکنند و در آن کمی شکر یا عسل میریزند. پس از مدتی آب در آن جمع میشود. آب را با قاشق برداشته و مصرف میکنند.
The turnip or white turnip (Brassica rapa subsp. rapa) is a root vegetable commonly grown in temperate climates worldwide for its white, bulbous taproot. The word turnip is a compound of tur- as in turned/rounded on a lathe and neep, derived from Latin napus. Small, tender varieties are grown for human consumption, while larger varieties are grown as feed for livestock. In the north of England, Scotland, Ireland, Cornwall and eastern Canada (Newfoundland), turnip (or neep) often refers to rutabaga, a larger, yellow root vegetable in the same genus (Brassica) also known as swede (from "Swedish turnip").
The most common type of turnip is mostly white-skinned apart from the upper 1–6 centimetres (0.39–2.36 in), which protrude above the ground and are purple or red or greenish where the sun has hit. This above-ground part develops from stem tissue, but is fused with the root. The interior flesh is entirely white. The root is roughly globular, from 5–20 centimetres (2.0–7.9 in) in diameter, and lacks side roots. Underneath, the taproot (the normal root below the swollen storage root) is thin and 10 centimetres (3.9 in) or more in length; it is trimmed off before the vegetable is sold. The leaves grow directly from the above-ground shoulder of the root, with little or no visible crown or neck (as found in rutabagas).
Turnip leaves are sometimes eaten as "turnip greens" ("turnip tops" in the UK), and they resemble mustard greens (to which they are closely related) in flavor. Turnip greens are a common side dish in southeastern U.S. cooking, primarily during late fall and winter. Smaller leaves are preferred, but the bitter taste of larger leaves can be reduced by pouring off the water from the initial boiling and replacing it with fresh water. Varieties of turnip grown specifically for their leaves resemble mustard greens and have small or no storage roots. These include rapini (broccoli rabe), bok choy, and Chinese cabbage. Similar to raw cabbage or radish, turnip leaves and roots have a pungent flavor that becomes milder after cooking.
Turnip roots weigh up to 1 kilogram (2.2 lb), although they are usually harvested when smaller. Size is partly a function of variety and partly a function of the length of time the turnip has grown. Most very small turnips (also called baby turnips) are specialty varieties. These are only available when freshly harvested and do not keep well. Most baby turnips can be eaten whole, including their leaves. Baby turnips are sold in yellow-, orange-, and red-fleshed varieties, as well as white-fleshed. Their flavor is mild, so they can be eaten raw in salads like radishes and other vegetables.
The turnip's root is high in vitamin C. The green leaves of the turnip top ("turnip greens") are a good source of vitamin A, folate, vitamin C, vitamin K and calcium. Turnip greens are also high in lutein (8.5 mg / 100 g).
One medium raw turnip (122 grams (0.269 lb)) contains these nutritional elements according to the USDA:
Like rutabaga, turnip contains bitter cyanoglucosides that release small amounts of cyanide. Sensitivity to the bitterness of these cyanoglucosides is controlled by a paired gene. People who have inherited two copies of the "sensitive" gene find turnips twice as bitter as those who have two "insensitive" genes, and thus may find turnips and other cyanoglucoside-containing foods intolerably bitter.
Some evidence shows the turnip was domesticated before the 15th century BC; it was grown in India at this time for its oil-bearing seeds. The turnip was a well-established crop in Hellenistic and Roman times, which leads to the assumption that it was brought into cultivation earlier. Sappho, a Greek poet from the seventh century BC, calls one of her paramours Gongýla, "turnip". Zohary and Hopf note, however, "there are almost no archaeological records available" to help determine its earlier history and domestication. Wild forms of the hot turnip and its relatives the mustards and radishes are found over west Asia and Europe, suggesting their domestication took place somewhere in that area. However, Zohary and Hopf conclude, "Suggestions as to the origins of these plants are necessarily based on linguistic considerations."
The 1881 Household Cyclopedia gives these instructions for field cultivation of turnips in the United States:
As a root crop, turnips grow best in cool weather; hot temperatures cause the roots to become woody and bad-tasting. They are typically planted in the spring in cold-weather climates (such as the northern US and Canada) where the growing season is only 3–4 months. In temperate climates (ones with a growing season of 5–6 months), turnips may also be planted in late summer for a second fall crop. In warm-weather climates (7 or more month growing season), they are planted in the fall. 55–60 days is the average time from planting to harvest.
Turnips are a biennial plant, taking two years from germination to reproduction. The root spends the first year growing and storing nutrients, and the second year flowers, produces seeds, and dies. The flowers of the turnip are tall and yellow, with the seeds forming in pea-like pods. In areas with less than seven-month growing seasons, temperatures are too cold for the roots to survive the winter. To produce seeds, pulling the turnips and storing them over winter is necessary, taking care not to damage the leaves. During the spring, they may be set back in the ground to complete their lifecycle.
Pliny the Elder considered the turnip one of the most important vegetables of his day, rating it "directly after cereals or at all events after the bean, since its utility surpasses that of any other plant". Pliny praised it as a source of fodder for farm animals, noting that this vegetable is not particular about the type of soil in which it grows and, because it can be left in the ground until the next harvest, it "prevents the effects of famine" for humans.
In most of England, the smaller white vegetables are called turnips, while the larger yellow ones are referred to as swedes. In the United States, turnips are the same, but swedes are usually called rutabagas. In Scotland, Ireland, parts of northern England, and parts of Canada, the usage varies and is sometimes confusingly reversed, with the yellow vegetables being called turnips or neeps, and the white ones swedes. Neeps are mashed and eaten with haggis, traditionally on Burns Night.
Turnip lanterns are an old tradition; since inaugural Halloween festivals in Ireland and Scotland, turnips (rutabaga) have been carved out and used as candle lanterns. At Samhain, candle lanterns carved from turnips — samhnag — were part of the traditional Celtic festival. Large turnips were hollowed out, carved with faces, and placed in windows, used to ward off harmful spirits. At Halloween in Scotland in 1895, masqueraders in disguise carried lanterns made out of scooped-out turnips.
In Nordic countries, turnips provided the staple crop before their replacement by the potato in the 18th century. The cross between turnip and cabbage, rutabaga, was possibly first produced in Scandinavia.
In Turkey, particularly in the area near Adana, turnips are used to flavor şalgam, a juice made from purple carrots and spices served ice cold. In Middle Eastern countries such as Lebanon, turnips are pickled.
In the United States, stewed turnips are eaten as a root vegetable in the autumn and winter. The greens of the turnip are harvested and eaten all year. Turnip greens may be cooked with a ham hock or piece of fat pork meat, the juice produced in the stewing process prized as pot liquor. Stewed turnip greens are often eaten with vinegar.
In Iran, boiled turnip-roots (with salt) are a common household remedy for cough and cold.
In the Punjab and Kashmir regions of India and Pakistan, turnips are used in variety of dishes, most notably Shab Degh.
In Brazil, turnips (nabos) are traditionally regarded as distasteful, or at least somewhat disagreeable and unpleasant at the first bite or taste. Part of this bias reportedly stems from the Middle Ages, where, for the reason of being inexpensive, turnips became in Iberia (and thus in Iberian-descended cultures) associated with the poor, and avoided in the diet of the nobility.