grated yam
Refers to a sticky, grated preparation of yam (often Japanese yam or nagaimo), commonly served over rice or with soba.
I like eating grated yam over rice.
このそば屋のとろろそばは絶品だ。
The grated yam soba at this soba shop is exquisite.
grated yam soup
Usually written in kana; the kanji form 薯蕷 is rare and may not be widely recognized.
Rare kanji spelling; learners are better off using the kana form.
The word is of Japanese origin, likely derived from the sound or texture of grated yam. The kanji 薯蕷 are Chinese-derived characters for yam, but the reading とろろ is an example of jukujikun (a native Japanese reading applied to a kanji compound).