Lesha is a plant-derived stimulant drink popular on a number of Terminus worlds.
The flavour of Lesha bears some noticeable resemblance to Terran coffee, though overall the taste and smell of the drink are different; intense and spicy.
Its powerful taste and smell make it appealing to batarians, and it's borderline extreme stimulant content (not limited to caffeine) is appealing to salarians in need of quick and powerful enough boost.
Lesha is only farmed on Sorvatan, and control of the Lesha trade is the motivation behind the Lesha Wars. Growth of Lesha off of Sorvatan is, so far, a futile effort, as the specific atmospheric and soil conditions are hard to reproduce.