The rhubarb here is the 'blush' variety, grown in Herefordshire and described as bright red. The blackcurrant isn't there for flavour, just to give the drink its colour, which is an honest touch to put in the ingredient list. Five ingredients total: sparkling water, apple juice, rhubarb juice (4%), blackcurrant juice, and natural flavourings. The rhubarb brings its characteristic tartness and the apple does the sweetening without needing any added sugar. Under 50 calories per can. A good option if you want something a bit more unusual than the standard fruit soda lineup.