Choose apples that are sweet - NOT tart apples like Granny Smith or Cripps Pink. Choose apples that are naturally sweet --Yellow Delicious, Red Delicious, Gala, Fuji, Rome and always use a mixture - never just one type. Sweet apples means no added sugar.
Peel, core and slice apples. In a pot big enough to hold all the apples, put an inch of water in the bottom, put all the apples in and cover with a lid. Cook until apples are very tender and smoosh when you stir them. Using a potato masher (or you can transfer the apples to a food processer, blender, or food ricer/mill), mash apples until desired consistency. Season to taste with cinnamon. Chill and serve. You may also freeze or can the sauce.