truffle
Refers to the edible fungus, often used in high-end cuisine. The French loanword is standard; the native term 西洋松露 (せいようしょうろ) exists but is rare.
from French truffe
Using dogs to search for truffles is a French tradition.
At this restaurant, pasta made with truffles is popular.
Truffles have a strong aroma, and even a small amount changes the flavor of a dish.
I eat pasta with shaved truffle sprinkled over it.
This oil has a strong truffle aroma.