Before the syrup habit took hold, Berliners often livened up this tart, low-strength beer with a shot of caraway schnapps (Kümmel) instead of raspberry or woodruff.
Berliner Weisse is a low-alcohol, sour wheat beer traditionally served with a shot of raspberry or woodruff syrup to balance its sharp acidity. Bartenders will ask 'rot oder grün?' — red or green — when you order one.