Fill a large pot halfway with water and cook apples until skin begins to peel and a knife or fork goes in easily.

Put about two  apples at a time through the strainer adding a little water as needed to make the applesauce smooth. If the applesauce seems a bit chunky when coming through the strainer, just cook the apples a bit longer.  

Continue straining all the apples.  Then add the sugar, lemon juice and cinnamon while still warm. Taste for sweetness and flavor.  I always start with less than I think since you can always add as needed.  Just remember that the applesauce will taste a bit sweeter when it is cold.  

Even after all these years, I never can guess how much to add, it really depends on the apples, so taste away!