Blackcurrant/Blackcurrant Sugar Free, Redcurrant Sugar Free, Elderflower Sugar Free, and Blueberry Sugar Free. Kasteel Cru Rose was also brewed in Alsace with a hint of elderflower & elderberry. It was made using vodka, cloudy apple juice, elderflower cordial and sparkling mineral water. The liqueur was, however, recently resurrected by Rob Cooper, the creator of St-Germain elderflower liqueur. In south-western Sweden, it is traditional to make a snaps liqueur flavoured with elderflower. Some traditional squashes contain herbal extracts, most notably elderflower and ginger. These drinks are sold commercially as Elderflower cordial. Blackboard Berliner Weisse&colon; Berliner Weisse with elderflower. However, versions of an elderflower cordial recipe can be traced back to Roman times. The high concentration of sugar in elderflower cordial gives it a long shelf life. Commercial production of elderflower cordial uses a scaled-up version of the process described. In Belgium, specimens were found on sandy soil under dead elderflower bushes. "The Girl Green as Elderflower" is often considered to be closely linked to Stow's life.