Sour + Salt = Good?

Was eating a nuclear level sour apple and some Indian co-workers mentioned to add some salt to the apple to mellow the sourness. At first, I was relatively skeptical but I was figuring why the f not. A great what the f moment...the sourness of the apple becomes slightly sweet and pleasantly sour. Give it a try next time on your next sour green apple and you'll avoid the "bitter apple face"...