A soft fruit. Ambrosia has a wonderful smell and taste, and produces a soft chemical high, which increases mood. However, it is slightly addictive if eaten too often.
Ambrosia is a raw drug (not a vegetarian food) that can be harvested only after an ambrosia sprout event (also available through trade), but cannot be grown by the player. It provides a +5 mood buff, +50% to joy and is slightly addictive. Ambrosia does spoil if not refrigerated.
Addiction to ambrosia is trivial compared to other drugs; it takes only 10 days before full recovery, and does not impair functioning; it only causes a -10 mood debuff as that pawn craves more ambrosia.
It is also somewhat rare to get an ambrosia addiction, as each fruit only has a 1% chance to give one.
It is harvested from ambrosia bushes. They can be harvested multiple times before dying, each time yielding 4 fruit when fully grown.
A good way to harvest them is to draw a growing zone over them, but forbid sowing. Colonists will then automatically harvest the bushes when they are fully grown.
The event can only occur, and thus the bush can only be found, in the following biomes: