For information on a similarly-named (but differently spelled) alcoholic beverage in the Re-imagined Series, see Ambrosia.
Starbuck and Cassie drink ambrosa aboard the Rising Star
(The Long Patrol
Ambrosa is an expensive alcoholic intoxicant, typically green in color.
The rarity of the beverage makes it valuable amongst the survivors of the Twelve Colonies.
Starbuck imagines being rich after finding many storage bins filled with ambrosa on Proteus. Were it not for the Cylon attack on Proteus, he would have become quite wealthy (The Long Patrol).