Sour balls are red hard boiled sugar sweets with a cherry flavour, and the sourest thing we make. The Flemish name, muiletrekkers, says it all: the sourness is so pronounced that it pulls your face, and that is exactly what makes them a favourite with children daring each other. Under the sourness sits a full cherry flavour that only emerges after the first shock. Because the sugar mass is boiled hard, a single sweet lasts a long time. Anyone looking for sour sweets comes here.