This is the 1226th most frequent Japanese word.
とんこつ
Pork bone.
In this sentence, 'とんこつ' refers to a specific type of Japanese ramen soup base made from pork bones.
とんこつラーメンは福岡でとても人気があります。
Tonkotsu ramen is very popular in Fukuoka.
Here, 'とんこつ' is used to describe the soup base itself, indicating its composition.
私は最近とんこつスープを作る方法を学びました。
Recently, I learned how to make tonkotsu soup.
In this example, 'とんこつ' is used to describe the flavor characteristic of the dish, usually indicating pork bone essence.