What is "mirabelle plum"

n. The sweet, edible drupaceous fruit of the mirabelle prune tree, a cultivar of the plum tree of the subspecies of (taxlink Prunus domestica subsp. syriaca subspecies noshow=1), often used in pies, wines, and brandy

The mirabelle plum, also known as the mirabelle prune (Prunus domestica subsp. syriaca), is the edible drupaceous fruit of the mirabelle plum 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 Anatolia.