Saffron
Saffron has been cultivated for thousands of years and it was during the Roman Empire even cultivated in Europe, these Saffron farms disappeared when the Empire fell but got back in the 700's. The price of Saffron is very high because of the intensive harvesting where you have to harvest 200,000 flowers to make one kilogram.
Saffron gives fragrance notes of metallic honey and hints of hay and grass.