Laser is a
spice known to the
Ancient Rome from near the
Greek colony of Kyrene in modern-day
Libya, used extensively as a flavor enhancer (the word "
umami" comes to mind). It was said to be from the
fennel family, somewhat like
asafoetida in strength, but tastily pungent and milder -- it was also used for birth control, and as a tea.
Pliny gives detailed instructions for identification and harvesting, but cautions the last known stalk of it was presented to the Emperor
Nero. The bane of all who seek to emulate
Apicius, efforts are now underway to identify and rebreed this valuable commodity.
In my own form of reconstructed Roman cookery, I use Worchestershire sauce, or pine nuts soaked in it.