Arguably, one of the highlights of the Christmas season is a delicious turkey dinner. The most common condiment for the turkey is a tart, mouth watering cranberry sauce. Have you ever wondered why cranberries are so sour? The sour taste comes from organic acids. These can easily be detected in the 1H and 13C NMR spectra of cranberries. The figure below shows the 1H and 13C NMR spectra of a D2O extract of crushed fresh cranberries.