noun
Welsh onion; green onion; spring onion; scallion
Refers specifically to Allium fistulosum, a type of thick-stemmed green onion common in Japanese cuisine. Often used in nabemono (hot pot) and as a condiment.
See also: ネギ
鍋に根深をたっぷり入れると美味しい。
It's delicious when you add plenty of Welsh onion to the hot pot.
根深の白い
Chop the white part of the green onion and use it as a condiment.
ネギ is the general term for green onion, while 根深 specifically refers to the thick-stemmed variety (Allium fistulosum) with a long white shank.
Compound of 根 (ne, 'root') and 深 (fuka, 'deep'), referring to the deep-rooted nature of this onion variety.