Yuzu is a kind of citrus and good smell. It is fruits for winter. We use it for accent of taste for dishes. For example, we put a few spots of juice in sauce for nabe ryori or salad dressing. Or Yuzu juice, jam, tea etc.
There is a custom that we take a bath of Yuzu in the winter solstice (Toji) . It is for our health. However, it is not usual now.
The smell is so special and I like it