The mirabelle plum, also known as the mirabelle prune (Prunus domestica subsp. syriaca), is the edible drupaceous fruit of the mirabelle prune tree, a cultivar of the plum tree of the genus Prunus. It is believed that the plum was cultivated from a wild fruit grown in Asia Minor.
In Romania, mirabelles are usually eaten before they are ripe. This is when they are sour and hard, but they are still enjoyed all over the country. It is arguable whether or not the fruit is better when ripe.