Eating some form of apples in a sauce dates back at least as early as the 4th Century C.E. when Apicus’ book on Roman Cookery was published. The tartness of apples back then hadn’t been bred out and the sharp flavors offset the taste of the fat in the food that was served at the time. Today we carry on the tradition, though apples are sweeter and somewhat mellower.
I love a good applesauce and will eat it just by itself. I used to buy jars and jars of applesauce at the store. Now you won’t catch me buying the stuff. If I want sauce made from apples, I buy apples.