Soor ploom

A Soor ploom is a sharp-flavoured, round, green boiled sweet originally associated with Galashiels, Scotland. They are sold loose by weight in paper bags, traditionally in "quarters" — a quarter of a pound. They are said to have been first made in 1337 in commemoration of a skirmish near Galashiels. A raiding party from England were overwhelmed and killed by local men when discovered eating unripe plums. A "childhood favourite," they are pale green and "slightly acid in flavour". They have been featured in Oor Wullie and The Broons cartoons.

Source: Wikipedia