Everything about Dioscorea Opposita totally explained
Dioscorea opposita (
nagaimo,
yamaimo,
Chinese yam,
Japanese mountain yam,
Korean yam; syn.
D. batatas,
D. oppositifolia) is a type of
yam (
Dioscorea) that may be eaten raw.
It is known as either
nagaimo (kanji: ; hiragana: ながいも) or
yamaimo (kanji: ; hiragana: やまいも) in
Japanese, depending on root shape. In Chinese it's known as
huái shān,
shān yào, or
huái shān yào . In Korea it's called
ma (hangul: 마; hanja: ).
Dioscorea opposita is an exception to the rule that yams must be cooked before consumption (due to harmful substances in the raw state). In
Japanese cuisine, it's eaten raw and grated, after only a relatively minimal preparation: the whole
tubers are briefly soaked in a vinegar-water solution, to neutralize irritant
oxalate crystals found in their skin. The raw vegetable is starchy and bland,
mucilaginous when grated, and may be eaten plain as a side dish, or added to noodles.
Dioscorea opposita is used in the Japanese cold noodle dish
tororo udon/soba. The grated
nagaimo is known as
tororo (in Japanese). In
tororo udon/soba, the
tororo is mixed with other ingredients that typically include
tsuyu broth (
dashi),
wasabi, and
green onions.
Jinenjo (
Dioscorea japonica, also called wild yam) is related variety of Japanese yam that's used as an ingredient in
soba noodles.
Homosexual lubricant
The jelly-like substance made from grating the yam,
tororojiru (とろろ汁), is often served in, or alongside, a number of other dishes. Interestingly, perhaps, this was widely used in the
Edo period as a
personal lubricant for homosexual activities, and it was thus considered improper for it to be eaten by a woman. This aversion also derives from the loud slurping sound one makes when eating it, which is considered to be un-ladylike.
Medical uses
The tuber is also used (often in dried form) in
traditional Chinese medicine and
Chinese herbology.
Further Information
Get more info on 'Dioscorea Opposita'.
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