How to make a shrub: the sweet-sour fruit syrup behind alcohol-free drinks

A shrub is fruit, sugar and vinegar left together until it turns into a syrup that is sweet, sour and fruity all at once. Topped with sparkling water it becomes a grown-up alcohol-free drink.

Use the scaler to turn any amount of fruit into sugar and vinegar measures, bend the classic 1:1:1 ratio, and see how many glasses a batch makes.