noun
pork bones
Refers to the bones themselves, often in a culinary context.
とんこつを長時間煮込んでスープをとる。
Simmer pork bones for a long time to make broth.
noun
pork bone broth; tonkotsu broth
A rich, milky broth made by boiling pork bones, especially famous in ramen.
とんこつラーメンはこってりした味が特徴だ。
Tonkotsu ramen is characterized by its rich flavor.
Specifically refers to ramen made with tonkotsu broth, while とんこつ alone can mean the bones or the broth.
Compound of 豚 (とん, 'pig') and 骨 (こつ, 'bone').